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Solve for theta: cos^2 theta-sin^2 theta...

Solve for `theta`: `cos^2 theta-sin^2 theta=1/2,0

A

`40^(@)`

B

`30^(@)`

C

`60^(@)`

D

`45^(@)`

Text Solution

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The correct Answer is:
B
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Statement I If 2 cos theta + sin theta=1(theta != (pi)/(2)) then the value of 7 cos theta + 6 sin theta is 2. Statement II If cos 2theta-sin theta=1/2, 0 lt theta lt pi/2 , then sin theta+cos 6 theta = 0 .