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• 19:51, 8 February 2022 0kelvin talk contribs created page Trigonometric identities (Created page with "At school we first learn how to measure angles and how to add and subtract angles. Later on comes the idea of sine, cosine and tangent. There is a question that is left unanswered until we learn the definitions of sine, cosine and tangent. The question is: we know that a ramp can be harder to walk on according to how much inclined it is, with flat being zero angle and 90° the hardest. Is there a relationship of how many units we walk forwards and how many units we go up...")