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If tan x=b/a, then the value of a cos 2x...

If `tan x=b/a`, then the value of a cos 2x+b sin 2x is :

A

a

B

`a-b`

C

`a+b`

D

b.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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  2. The expression (cos 2b-cos 2a)/(sin 2b-sin2a) is equal to:

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  3. If tan x=b/a, then the value of a cos 2x+b sin 2x is :

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  4. If sin 5theta = cos 4theta where 5theta and 4theta are acute angles, f...

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  5. If 2 sin theta=a+1/a, a is real, then the solution set for a is :

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  6. The maximum value of a cos x + b sin x is :

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  7. If in a DeltaABC, sin A =sin^(2) B and 2 cos ^(2)A=3 B, then the Delta...

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  8. If the angle opf a triangle are in the ratio 1:2:3, then show that the...

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  9. If in a triangle, a/(cosA)= b/(cos B) =c/(cos C), then the triangle is...

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  10. Let the angles A, B, C of triangle ABC be in A.P. and let b:c= sqrt3:s...

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  11. The period of sin 2 theta is :

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  12. If y = sec^2 theta+ cos^2 theta, theta ne 0, then :

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  13. The sides BC, CA and AB of a triangle ABC are of lengths a, b and c re...

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  14. The angle of elevation of the top of a hill from a point is alpha. Aft...

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  15. If tan(x/2)=cosec x-sin x, then find the value of tan^(2) (x/2).

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  16. Consider the system of equations in x, y, z as x sin 3 theta-y + z=0, ...

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  17. Prove that cos^(4) .(pi)/(8) + cos^(4).(3pi)/(8)+cos^(4).(5pi)/(8)+c...

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  18. Prove that : "tan"(pi/(4)+1/(2)"cos"^(-1)a/(b))+"tan"(pi/(4)-1/(2)"cos...

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  19. The equation sqrt3 sinx+cos x=4 has:

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  20. The value of cos 15^@ cos 7 1^@/2 sin 7 1^@/2 is:

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