Question

Find x if cos2x = 1 - 2 sin^2 30°.​

Answer 1

Answer:

x is 30

Step-by-step explanation:

cos2x = 1-2sin²30

cos 2x = 1- 2*(1/2)² [ sin30=1/2]

cos2x = 1- 2*1/4

cos2x = 1-1/2

cos2x = 1/2 ________(1)

cos 60 =1/2 ________(2)

from eqn 1and2

cos 2x = cos60

2x = 60

x =60/2

x= 30

Answer 2

Step-by-step explanation:

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