![]() ![]() Do not ask exact duplicates of FAQ questionsĭo not post questions that are an exact duplicate of something already answered in the FAQ. See our policies on allowed topics for more details.Ĥ. Questions that straddle the line between learning programming and learning other tech topics are ok: we don't expect beginners to know how exactly to categorize their question. Tech support and hardware recommendation questions count as "completely unrelated". Self promotion from first time posters without prior participation in the subreddit is explicitly forbidden.ĭo not post questions that are completely unrelated to programming, software engineering, and related fields. When in doubt, message the mods and ask them to review your post. ![]() Your post should not "feel spammy".ĭistinguishing between tasteless and tasteful self-promotion is inherently subjective. In short, your posting history should not be predominantly self-promotional and your resource should be high-quality and complete. When posting some resource or tutorial you've made, you must follow our self-promotion policies. ![]() See our policies on acceptable speech and conduct for more details. Disagreement and technical critiques are ok, but personal attacks are not.Ībusive, racist, or derogatory comments are absolutely not tolerated. Communicate to others the same way you would at your workplace. No unprofessional/derogatory speechįollow reddiquette: behave professionally and civilly at all times. See conceptual questions guidelines for more info. If your question is similar to one in the FAQ, explain how it's different. Read our FAQ and search old posts before asking your question. Many conceptual questions have already been asked and answered. See debugging question guidelines for more info. If you got an error, include the full error message. The output you expected, and what you got instead.A minimal, easily runnable, and well-formatted program that illustrates your problem.If you need help debugging, you must include: ACTS still starts in quadrant 1 but goes clockwise going through quadrants 1, 4, 3, then 2.Welcome to LearnProgramming! New? READ ME FIRST! Posting guidelines Frequently asked questions Subreddit rules Message the moderators Asking debugging questions.CAST still goes counterclockwise but starts in quadrant 4 going through quadrants 4, 1, 2, then 3.These have the disadvantages of not going sequentially from quadrants 1 to 4 and not reinforcing the numbering convention of the quadrants. Other easy-to-remember mnemonics are the ACTS and CAST laws. Quadrant IV (angles from 270 to 360 degrees, or 3π/2 to 2π radians): Cosine and secant functions are positive in this quadrant.Quadrant III (angles from 180 to 270 degrees, or π to 3π/2 radians): Tangent and cotangent functions are positive in this quadrant.Quadrant II (angles from 90 to 180 degrees, or π/2 to π radians): Sine and cosecant functions are positive in this quadrant.Quadrant I (angles from 0 to 90 degrees, or 0 to π/2 radians): All trigonometric functions are positive in this quadrant.The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4. Signs of trigonometric functions in each quadrant.Īll Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. Longer mnemonics for these letters include "Oscar Has A Hold On Angie" and "Oscar Had A Heap of Apples." All Students Take Calculus Īn alternate way to remember the letters for Sin, Cos, and Tan is to memorize the nonsense syllables Oh, Ah, Oh-Ah (i.e. Communities in Chinese circles may choose to remember it as TOA-CAH-SOH, which also means 'big-footed woman' ( Chinese: 大腳嫂 Pe̍h-ōe-jī: tōa-kha-só) in Hokkien. The order may be switched, as in "Tommy On A Ship Of His Caught A Herring" (tangent, sine, cosine) or "The Old Army Colonel And His Son Often Hiccup" (tangent, cosine, sine) or "Come And Have Some Oranges Help To Overcome Amnesia" (cosine, sine, tangent). Phrases Īnother method is to expand the letters into a sentence, such as "Some Old Horses Chew Apples Happily Throughout Old Age", "Some Old Hippy Caught Another Hippy Tripping On Acid", or "Studying Our Homework Can Always Help To Obtain Achievement". ˌ s oʊ k ə ˈ t oʊ ə/ SOH-kə- TOH-ə, similar to Krakatoa). ![]() One way to remember the letters is to sound them out phonetically (i.e. Sine = Opposite ÷ Hypotenuse Cosine = Adjacent ÷ Hypotenuse Tangent = Opposite ÷ Adjacent The sine, cosine, and tangent ratios in a right triangle can be remembered by representing them as strings of letters, for instance SOH-CAH-TOA in English: Image mnemonic to help remember the ratios of sides of a right triangle ![]()
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