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Graph one period of the six trigonometric functions and identify the following for each. ... sec x = 1/cos x vi. cot x = 1/tan x. Quotient identities ... cot x = cos x / sin x. Double Angle Formulas. sin 2x = 2 sin x cos x. cos 2x = cos2x – sin2x = 2cos2x – 1 = 1 – 2sin2x. Power Reducing Formulas. sin 2 x= 1- cos 2x 2 ii. cos 2 x= 1+ cos ... ................
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