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TRIG IDENTITIES MATCH UP squares sides. T position COS X cos2 x sec x cot x sin x x UIS COS X cot x sin x sin x sec2 x - 1 tan~ x sin2 x cot 2 x sec x cot x sin x cos x tan2 x tan x sec x cos x sec x tan x 1+sin x tan x cos x L cos2 x sin~ x sin2 x sec2 x 1 + tan2 x cot x tan x cot x 1 - sin x cos x sec x cOS X COS X cosz X sec x cot x sin x 1 + cotz x 1 - cos2 x sin 2 x cos x tan x CSC X sin 2 x sin x 1+cos x 1 - cos x COS X CSC X csc2x COS X sin x 1 + cot2 x tan x sin? x + cos 2x cot x COS X sin x sin x CSC X sec 2 x - tan x cot 2 x - csc2 x cos2 X CSC X secz x tan x @ 2016 joan kessler distancemath.com .. . er notes