Math, asked by mansi509290, 11 months ago

answer the question with full explaination

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Answered by pal69

1

Answer:

cos(a+b)=1/2=cos60°

a+b=60°......1

sin(a-b)=1/2=sin30°

a-b=30.........2

add (1)+(2)

2a=90°

a=45°

so, b=15°

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