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A+B = 90^(@) rArr cos A cos B in...

`A+B = 90^(@) rArr cos A cos B in`

A

`[-(1)/(3), (1)/(3)]`

B

`[-(1)/(2),(1)/(2)]`

C

`[-(1)/(4),(1)/(4)]`

D

`[-(3)/(4), (3)/(4)]`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PERIODICITY AND EXTREME VALUES-Practice Sheet (Exericise-I) Level-II (Straight Objective Type Questions)
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  2. 5 cos theta + 3 cos ( theta - (pi)/(3) )+8 in

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  3. A+B = 90^(@) rArr cos A cos B in

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  4. A+B = 90^(@) rArr sin A + sin Bin

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  5. The range of cos^(2) x + sin^(4) x is

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  6. The range of f(x)=-3 cos sqrt(3x+x+x^(2)) is

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  7. The minimum and maximum values of 8 cos 3x - 15 sin3x are

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  8. The maximum value of (3 ) /( 5 sin x-12 cos x+19) is

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  9. cos5x=16 cos^(5) x -20 cos^(3) x +5 cos x in

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  10. 3 sin^(2) x -4 cos^(2) x in

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  11. The maximum value of cos x ((cos x )/( 1- sin x) + (1- sin x)/( cos x)...

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  12. Minimum value of 9 sec^(2) theta + 4 cosec^(2) theta + 7 is

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  13. The minimum value of the expression sin alpha + sin beta+sin lambda, w...

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  14. If a le 3 cos x + 5 sin ( x - pi//6) le b for all x , then ( a, b) is

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  15. cos^(2) (60^(@) - x) + cos^(2) (60^(@) +x) in

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  16. cos^(2) (60^(@) - x) + cos^(2) (60^(@) +x) in

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  17. sin^(2) x + 4 sin x+5 in [k, 5k ] rArr k =

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  18. The least value of cos^(2) theta - 6 sin theta.cos theta+ 3 sin^(2) th...

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  19. The minimum value of Sinx ((1-cos x)/(sin x) + (sin x)/( 1-cos x)) ...

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  20. If f(x) = 2+ cos^(2) x + sec^(2) x, its value always is

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