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( cos^(2) 33^(@) - cos^(2) 57^@)/( sin 2...

`( cos^(2) 33^(@) - cos^(2) 57^@)/( sin 21^(@) - cos 21^(@))=`

A

`1//sqrt(2) `

B

`-1//sqrt(2) `

C

`1//2`

D

`-1//2`

Text Solution

Verified by Experts

The correct Answer is:
B
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