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svet-max [94.6K]
3 years ago
9

Prove this questionplease​

Mathematics
1 answer:
vovikov84 [41]3 years ago
8 0

Answer:

see explanation

Step-by-step 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

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8 0
3 years ago
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