-cos 4 A-sin 4 A- is equal to-A- 2 sin 2 A -1B- 2 cos 2 A-1C- 2 cos 2 A -1D- 2 sin 2 A -1

The correct option is B 2 cos2 A 1 cos4 A sin4A = cos4 A (1 cos2A)2 = cos4 A (1 + cos4A 2 cos2A) = 2 cos2 A 1 ...

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Implicit Differentiation

[cos 4 A-sin ...

Question

[cos⁴ A - sin⁴A] is equal to:

2 sin² A - 1

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2 sin² A + 1

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2 cos² A - 1

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2 cos² A + 1

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Solution

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