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Please provide me the solution of this question. Question no. 5(in the image)

Please provide me the solution of this question. Question no. 5(in the image)

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Grade:12th pass

1 Answers

Sandeep Tegala
24 Points
6 years ago
write sin(90+30-A)=cos(30-A)
       sin(90+30+A)=cos(30+A)
the sum reduces to cos^2(30+A)+cos^2(30-A)+sin^2(A)
expand it and put cos30 and sin30 values it simplifies to 3/2(cos^2+sin^2)=3/2

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