How to solve this question?
cos x cos 200 + sin x sin 200 = square root 3/2.
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Hint: Consider using the angle sum/difference identity for cosine...
COS(x-20)=square root 3/2
Originally Posted by MINOANMAN COS(x-20)=square root 3/2
then easy... You have robbed the OP of the chance to find that on their own...it is good forum etiquette NOT to come along behind someone who has offered a suggestion and essentially solve the problem.
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