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If cos 2 theta =(sqrt(2)+1)( cos theta ...

If ` cos 2 theta =(sqrt(2)+1)( cos theta -(1)/(sqrt(2)))`, then the value of ` theta ` is

A

`2npi + (pi)/4`

B

`2n pi +- (pi)/3`

C

`2npi - (pi)/4`

D

none of these

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The correct Answer is:
B
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-MULTIPLE CHOICE QUESTIONS - PART - B : MASTERING THE BEST
  1. If: tan theta + tan(pi/2 - theta)=2, then: theta =

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  2. If : sin ((pi)/4 cdot cot theta) = cos ((pi)/4 cdot tan theta), then :...

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  3. If cos 2 theta =(sqrt(2)+1)( cos theta -(1)/(sqrt(2))), then the valu...

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  4. If : cos 2 theta = sin alpha, then :theta is given by

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  5. Number of values of x in the interval [0, 3pi] satisfying the equation...

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  6. If : 1 - cos theta = sin theta cdot sin (theta/2), then :theta =

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  7. If : (tan 3 theta - 1)/(tan 3 theta + 1) = sqrt(3), then : theta =

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  8. If : sin 5x + sin 3x + sin x = 0, where 0 lt x le (pi)/2, then : x =

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  9. If : cos 6 theta + cos 4 theta + cos 2 theta + 1 = 0, where, 0 lt th...

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  10. If : 0 lt theta lt pi/2 and sin 7theta + sin 4 theta + sin theta=0, th...

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  11. Solve 5 cos 2 theta+2 "cos"^(2) theta/2 +1=0, -pi lt theta lt pi.

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  12. "cot" theta = "sin" 2 theta, theta ne n pi, n in Z, "if" theta equals

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  13. If : cot theta + cot((pi)/4 + theta) = 2, then : theta =

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  14. If sin 3 alpha =4 sin alpha sin (x+alpha ) sin(x-alpha ) , then

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  15. The number of values of x in the interval [0, 5pi] satisfying the equa...

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  16. If, in triangleABC, (s-a)(s-b)=s(s-c), then: angleC=

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  17. If, in a Delta ABC, (s - b)(s-c) = x cdot sin^(2) (A/2), then : x =

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  18. In a Delta ABC, sin B : sin (A + B) =

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  19. If, in a Delta ABC, c^(2) + a^(2) - b^(2) = ac, then : /B =

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  20. In a Delta ABC, if : a = 16, b = 24 and c = 20 then : cos(B/2) =

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