cos⁴ A-sin⁴ A+1 solve this
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Step-by-step explanation:
(AB-AC+1 by BC)⁴ IS THE ANSWER FOR YOUR QUESTION
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Answer:
Step-by-step explanation:
=(cos²A-sin²A)²+1
=cos²A+sin²A-2sin²A×cos²A+1 (∵cos²A+sin²A=1)
=1-2sin²A×cos²A+1
=2-2sin²A×cos²A
=2(1-sin²A×cos²A)
=2(1-sin²2A)
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