prove it cos^4-sin^4=2cos^2A-1
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Answered by
2
Answer:
refer to the attachment for the solution.
if it helps you then mark as brainliest.
Explanation:
formula used:
sin²∅ + cos²∅ = 1.
and
a² - b² = ( a + b)( a - b).
Attachments:

Answered by
9
To Prove :
LHS :
RHS :
Proving LHS :
Now, by using this formula , we get :
Now, by applying this formula we get :
Therefore, LHS = RHS.
Hence proved that,
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