sin(x+y)sin(x-y)=sin²x-sin²y=cos²y-cos²x
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Answered by
3
Answer:
first of all use the sum identity then change the sin into cos and cos into sin as you can see
similarly you can prove for
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2
Given :
Step-by-step explanation:
hence proved
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https://brainly.in/question/10780881
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