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If cos^(4)theta-sin^(4)theta=(2)/(3), th...

If `cos^(4)theta-sin^(4)theta=(2)/(3)`, then the value of `1-2sin^(2)theta` is

A

0

B

`2/3`

C

`1/3`

D

`4/3`

Text Solution

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The correct Answer is:
B
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ARIHANT SSC-TRIGONOMETRY-Exercise Base Level Questions
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  9. What is sin A cos A tan A + cos A cot A equal to ?

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  10. 2(cos^2theta-sin^2theta)=1 ( theta is a positive acute angle), then ...

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  11. The minimum value of cos^2 theta+ sec^2 theta is

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  12. If cos x + cos y =2, then the value of sinx + sin y is

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  13. if sec^(2)theta+tan^(@)theta=(7)/(12), then sec^(4)theta-tan^(4)theta=

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  14. The numerical value of ((1)/(costheta)+(1)/(cot theta))((1)/(costhet...

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  16. If tan 2 theta.tan 4 theta =1, then the value of 3 theta is

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  18. If A=sin^(2) theta + cos^(4) theta , then for all values of theta ,...

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  19. The minimum value of 2 sin^2 theta + 3cos^2 theta is

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