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sinx cosx, cotx = cosx sinx • Pythagorean Identities sin2x+cos2x = 1 tan2x+1 = sec2x 1+cot2x = csc2x • Co-function Identities sin(π/2−x) = cosx cos(π/2−x) = sinx tan(π/2−x) = cotx • Odd/Even Formulas sin(−x) = −sinx – Sine is an odd function. cos(−x) = cosx – Cosine is an even function. tan(−x) = −tanx – Tangent ... ................
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