Math, asked by A716, 7 months ago

If Cosx = 1/4
then the value of Cos 3x=?
a)11/16
b)-11/16
c)16/11
d)-16/11

Answers

Answered by ravi2303kumar

1

Answer:

b)-11/16

Step-by-step explanation:

Given Cosx = 1/4

cos 3A = 4 cos³A - 3cosA

hence

cos 3x = 4 cos³x - 3 cosx

= 4 (1/4)³ - 3 (1/4)

= ( 1/16) - (3/4)

= (1-12)/16

= -11/16

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