how to solve this problem
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2cos²a-1
=2cos²a-(cos²a+sin²a)
=2cos²a-cos²a-sin²a
=cos²a - sin²a
Substituting this in the equation...

Hence Proved.
Hope it Helps...
Here,i used (a) instead of (theta)...
Regards,
Leukonov.
=2cos²a-(cos²a+sin²a)
=2cos²a-cos²a-sin²a
=cos²a - sin²a
Substituting this in the equation...
Hence Proved.
Hope it Helps...
Here,i used (a) instead of (theta)...
Regards,
Leukonov.
Leukonov:
bf? why do i need a bf? and What?
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