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If 0^@ < theta < 20^@ and cos^2 6theta -...

If `0^@ < theta < 20^@` and `cos^2 6theta - cos 6theta = 0`, then the value of `theta` is

A

`15^@`

B

`16^@`

C

`17^@`

D

`18^@`

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UNITED BOOK HOUSE-Trigonometric Ratios of Complementry Angle-Exercise
  1. Value of [cos(40^@ + theta) - sin (50^@ - theta)] is

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  2. If alpha + beta = 90^@ and cot alpha = 4/3 then cot beta =

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  3. If 0^@ < theta < 20^@ and cos^2 6theta - cos 6theta = 0, then the valu...

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  4. If tan 2alpha = cot 2beta, then sec(alpha + beta) =

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  5. If tan 2theta . Tan 3 theta =1, then sin5theta =

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  6. If sec(90^@ - alpha) = 4 - cosec alpha (0^@ < alpha < 90^@), then the ...

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  7. Calculate the slope of a line, that passes through the origin, and the...

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  8. Sin 2A = 2sin A is true when A =

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  9. It A + B = 90^@, then (tan A tan B + tan A cot B)/(sin A sec B) - (sin...

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  10. If tan A = cot B, then prove that A + B = 90°.

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  11. (sin^2 22^@ + sin^2 68^@ + cot^2 68^@) equals

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  12. (2 tan 30^@)/(1 - tan^2 30^@) is equal to

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  13. If theta and (2theta - 45^@) are acute angles such that cosec theta co...

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  14. A, B and C are interior angles of a triangle ABC, then sin ((B + C)/(2...

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  15. The value of tan 10^@ tan 15^@ 75^@ tan 80^@ is

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  16. If 5theta and 4theta are acute angles satisfying sin 5theta = cos 4the...

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  17. [sin^2 1^@ + sin^2 2^@ +sin^2 3^@ + ……………….. + sin^2 87^@ + sin^2 88^@...

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  18. (sin^2 1^@ + sin^2 3^@ + sin^2 5^@ + ………………… + sin^2 85^@ + sin^2 87^@...

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  19. The value of (cos(90^@ - theta)sec(90^@ - theta) tan theta)/(cosec(90^...

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  20. The value of (tan 47^@ + cot 27^@)/(tan 43^@ + cot 63^@) is

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