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Prove this question please​
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1 vote
Prove this question
please​

Prove this question please​-example-1
User Hidde
by
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1 Answer

6 votes

Answer:

see explanation

Explanation:

Consider the left side


cos^(4)A +
sin^(4)A - 2cos²Asin²A ← is the expansion of

= (cos²A - sin²A)²

Substitute sin²A = 1 - cos²A

= (cos²A - (1 - cos²A) )²

= (cos²A - 1 + cos²A)²

= (2cos²A - 1 )²

= right side , then proven

User Rspacer
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4.8k points
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