Math, asked by avinash20, 1 year ago

Simplify: Cos(x15)Cosx Sin(x15) Sinx

Answers

Answered by bhagatpriyanshu1

Using cosA.cosB+sinA.sinB=cos(A−B), we getcosx.cos(x+15)+sinx.sin(x+15)=cos(x+15−x)=cos15=cos(60−45)=cos60.cos45+sin60.sin45=12.12√+3√2.12√=3√+122√ [Answer]

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