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The expression 4 cos^4 x - 2 cos2x - 1/2 cos4x when simplified reduces to: (1) 2/3 (2) 3/2 (3) -2/3 (4) -3/2

The expression 4 cos^4  x - 2 cos2x - 1/2 cos4x when simplified reduces to:
(1) 2/3
(2) 3/2
(3) -2/3
(4) -3/2

Grade:11

1 Answers

Umesh Kumar Mandal
13 Points
5 years ago
Put x=30. Then we will get.
=4.cos^4(30) -2 cos60 - 1/2 cos120 = 3/2 ans..after solving this equation.we will get ans as 3/2.....Thanks u from Umesh Kr Mandal, Inspector PO..Kolkata Customs.

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