trig_identities - c 2 = a 2 b 2 2 ab cos C sin x = sin x...

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TRIG IDENTITIES sin 2 x + cos 2 x = 1 tan x = sin x cos x tan 2 x + 1 = sec 2 x cot x = cos x sin x 1 + cot 2 x = csc 2 x csc x = 1 sin x sec x = 1 cos x cot x = 1 tan x sin( A ± B ) = sin a cos B ± sin B cos A cos( A ± B ) = cos A cos B ! sin A sin B sin2 A = 2sin A cos A cos2 A = cos 2 A ! sin 2 A or 2 cos 2 A ! 1 or 1 ! 2sin 2 A Law of Sines: sin A a = sin B b = sin C c Law of Cosines: c 2
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Unformatted text preview: c 2 = a 2 + b 2 ! 2 ab cos C sin( ! x ) = ! sin x cos( ! x ) = cos x cos 2 x = 1 + cos2 x 2 sin 2 x = 1 ! cos2 x 2 [these two for 16B and 21B]...
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