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cos^(2) 57^(@) + cos^(2) 63^(@) + cos 57...

`cos^(2) 57^(@) + cos^(2) 63^(@) + cos 57^(@) cos 63^(@)` का यथार्थ (exact) मान है

A

1

B

`(1)/(4)`

C

`(1)/(2)`

D

`(3)/(4)`

लिखित उत्तर

Verified by Experts

The correct Answer is:
D
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