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If "cos" 20^@-"sin"^20^@=p, then "cos" 4...

If `"cos" `20^@`-"sin"^20^@=p`, then "cos" `40^@` is equal to

A

`p^2sqrt(2-p^2)`

B

`psqrt 2-p^2)`

C

`p+sqrt(2-p^2)`

D

`p-sqrt(2-p^2)`

Text Solution

Verified by Experts

The correct Answer is:
B
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