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The value of sin^(2)65^(@)+sin^(2)25^(@)...

The value of `sin^(2)65^(@)+sin^(2)25^(@)+cos^(2)35^(@)+cos^(2)55^(@)` is

A

0

B

1

C

2

D

`(1)/(2)`

लिखित उत्तर

Verified by Experts

The correct Answer is:
c

`Sin^(2)65^(@)+sin^(2)25^(@)+cos^(2)35^(@)+cos^(2)55^(@)`
`=sin^(2)65^(@)+sin^(2)(90^(@)-65^(@))+ `
`[cos ^(2)35^(@)+cos^(2)[90^(@)-35^(@))]`
`(sin^(2)65^(@)+cos^(2)65^(@))+(cos^(2)35^(@)+sin^(2)35^(@))~
`=1+1=2`
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