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Question

sin285+sin25= ______

A
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B
1
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C
12
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D
23
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Solution

The correct option is A 1
Given, sin285o+sin25o
We know that sin2Ao=cos2(90A)o

sin285o+sin25o=cos2(9085)o+sin25o=cos25o+sin25o=1

(Since, cos2Ao+sin2Ao=1)

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