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Exercise #17Sum and Difference Identities II Express cos x as a function of x only. 2 Therefore, we can use the sum and difference identities when proving identities.Example 1 3Prove sin x sin x cos x . 3 2 2Working BackwardsEvaluate without using a calculator: 5 5 sin cos cos sin 9 36 9 36
TryFind the exact value of: cos cos sin sin 12 3 12 3ExampleProve that sin( ) sin( ) 2cos sin .Journal 4 5 3Given that tan where is not in quadrant IV and cot where , 3 12 2find cos( ) .