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Unformatted text preview: sin x sin y sin( x + y ) = sin x cos y + cos x sin y T6. sin 2x = 2 sin x cos x cos 2x = cos 2 x-sin 2 x = 1-2 sin 2 x = 2 cos 2 x-1 T7. cos 2 x = 1 + cos 2x 2 sin 2 x = 1-cos 2x 2 T8. f ( x ) = f C 2-x f 2- = f C ( ) where f is any one of the six basic trig functions and f C is the co-function of f . 2...
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