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17.cos^4theta- sin^4theta is equal to (a...

17.`cos^4theta- sin^4theta` is equal to (a) 1 -2` sin^2(theta/2) ` (b)`2cos^2theta-1` (c)`1+2sin^2(theta/2)` (d)`1+2cos^2theta`

A

`1- e sin ^(2) ((theta)/(2))`

B

`2 cos ^(2) theta -1`

C

`1+2 sin ^(2) ((theta )/(2))`

D

`1+ 2 cos ^(2) theta `

Text Solution

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The correct Answer is:
B
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