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Prove the following equation is an identity. sin x 1+cos x 1 +cos x = 2cscx sin x Reciprocal Identities 1 R1. CSCX = - R2. secx = R3. cotx = sin x COSX tan x Quotient Identities sin x Q1. tan X = Q2. COSX cotX = COS X sinx Pythagorean Identities P1. sin x + cos? x = 1 or sin x =1-cos? x or cos? x =1-sin x P2. 1+ tan? x = sec? x; P3. 1+ cot2 x = csc2 x