Grade 11Trigonometry
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
1 Answer
Umesh Kumar Mandal
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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