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sin^4a-cos^4a=1-2 cos^2a
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Answer:
refer below !!
Step-by-step explanation:
Consider LHS:
sin⁴a-cos⁴a=(sin²a+cos²a)(sin²-cos²a)
= -(cos²a-sin²a)
= -(2cos²a-1)
=1-2cos²a
Remember I have used trigonometry identities like
- sin²a+cos²a=1
- cos²a-sin²a=2cos²a-1
Hope this helps !!
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