Exercise #17 notes

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Exercise #17 notes

  1. 1. 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
  2. 2. TryFind the exact value of:     cos cos  sin sin 12 3 12 3ExampleProve that sin(   )  sin(   )  2cos  sin  .Journal 4 5 3Given that tan    where  is not in quadrant IV and cot   where     , 3 12 2find cos(   ) .

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