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If sintheta1+sintheta2+sintheta3=3, the...

If `sintheta_1+sintheta_2+sintheta_3=3,` then `costheta_1+costheta_2+costheta_3` is equal to 3 (b) 2 (c) 1 (d) 0

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Value of `sin` ratio ranges from `-1` to `1`
Now, `sintheta_1+sintheta_2+sintheta_3=3`
we must have each of them as:
Hence, `theta_1=theta_2=theta_3=90^@`and as `cos90^@=0`
...
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RD SHARMA-TRIGONOMETRIC FUNCTIONS-Solved Examples And Exercises
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  2. If sin x+cosec\ x=2, then write the value of sin^n x+cos e c^n xdot

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  3. If sintheta1+sintheta2+sintheta3=3, then costheta1+costheta2+costheta...

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  4. Write the value of sin 10^0+sin 20^0+sin 30^0+....+sin 360^@

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  7. Write the value of cos1^0+cos2^0+cos3^0++cos 180^0dot

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  10. Write the least value of cos^2theta+sec^2thetadot

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  11. If x=sin^(14)theta+cos^(20)theta , then write the smallest interval in...

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  12. If 3sintheta+5costheta=5, then write the value of 5sin theta-3costheta...

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  13. If sectheta=x+1/(4x) , then s e ctheta-t a ntheta is equal to -2x ,1/(...

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  14. If pi/2 < theta < (3pi)/2 then sqrt ((1-sin theta)/(1+sin theta))= a....

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  15. If pi lt theta lt 2pi then sqrt ((1+cos theta)/(1-cos theta))= a. co...

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  16. If sec theta= x+1/(4x) then sec theta+ tan theta= a, x, 1/(x), b. 2x, ...

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  17. If pi/2ltthetaltpi, then sqrt((1-sintheta)/(1+sintheta))+sqrt((1+sinth...

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  18. If tan theta+sectheta=sqrt(3),\ 0<theta<pi, then theta is equal to (5p...

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  19. If t a ntheta=-1/(sqrt(5)) and theta lies in the IVB quadrant, then th...

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  20. Prove the followings : sin^6A+cos^6A+3sin^2A cos^2A= 1

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