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Find cos4A−sin4A.cos^4 A - sin^4 A.

Asin² A +cos² A

Bcos2A

C0

D2

Answer:

B. cos2A

Read Explanation:

cos⁴(A) - sin⁴(A) = cos(2A)

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Find the area of the triangle; AB = 5, BC = 8 and ∠CAB = 60

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In the adjoining figure line l is parallel to m. What is the value of 2x+y ?

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