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If cosA+cosB=mand sinA+ sinB=n wherem, n...

If `cosA+cosB=mand sinA+ sinB=n` wherem, `n ne0,` then `sin(A+B)` is equal to

A

`(mn)/(m+n)`

B

`(m^(2)+n^(2))/(2mn)`

C

`(2mn)/(m^(2)+n^(2))`

D

`(mn)/(m^(2)+n^(2))`

Text Solution

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The correct Answer is:
c
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NAGEEN PRAKASHAN ENGLISH-TRIGNOMETRIC FUNCTIONS-EXERCISES 3Q
  1. If A=sin^(2)theta+cos^(4)theta, then find all real values of theta.

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  2. Find the value of sqrt(3)cosec20^(@)-sec20^(@)

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  3. If cosx=tany,cosy=tanz and cosz=tanx, then sin^2x=?

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  4. 3(sintheta-costheta)^4+6(sintheta+costheta)^2+4(sin^6theta+cos^6theta)...

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  5. If sinx+cosx=a, then (i) sin^(6)x+cos^(6)x=..... (ii) abs(sinx-...

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  6. If cosA+cosB=mand sinA+ sinB=n wherem, n ne0, then sin(A+B) is equal t...

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  7. The solution set of the equation 4 sin theta. Cos theta-2 cos theta-2s...

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  8. Solutions of the equations (2cosx-1)(3cosx+4)=0 is [0,2pi] is:

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  9. If (sin(theta+alpha))/(cos(theta-alpha))=(1-m)/(1+m) , prove that tan(...

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  10. If 4sin^(4)x+cos^(4)x=1, then one general value is:

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  11. If (2+sqrt(3))costheta=1-sintheta, then one general value is:

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  12. The general solution of equation 3 tan(theta - 15^o) = tan(theta+15^o)...

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  13. The solution of costheta.cos2theta.cos3theta=1/4,0 lt theta lt pi/4 is...

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  14. If sectheta-1=(sqrt(2)-1)tantheta, then general value of theta is:

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

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  16. The number of solutions of the equation sintheta+costheta=2 are:

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  17. If sintheta-3sin2theta+sin3theta=costheta-3cos2theta+cos3theta, then o...

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  18. If 3tan^(2)theta-2sintheta=0, then general value of theta is:

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  19. If costheta+cos3theta+cos5theta+cos7theta=0, then general value of the...

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  20. Maximum value of (3sintheta+4costheta) is:

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