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

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

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RD SHARMA ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. If sin x=cos^2x ,\ then write the value of cos^2x\ (1+cos^2x)dot

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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+costheta3...

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

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  5. A circular wire of radius 15cm is cut and bent so as to lie along the ...

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  6. The value for 2(sin^6theta+cos^6theta)-3(sin^4theta+cos^4theta)+1 is

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

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  8. If cot(alpha+beta)=0\ ,\ then write the value of "sin"(alpha+2beta) .

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  9. If t a n A+cot A=4, then write the value of t a n^4A+cot^4Adot

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

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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 tanθ+secθ=√3,0 <θ<π, then θ is equal to a. (5pi)/6 b. (2pi)/3 c. pi...

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

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  20. sin^6A+cos^6A+3sin^2A cos^2A=\ a. 0 b. 1 c. 2 d. 3

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