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Prove that: sin 3x + sin 2x -sin x = 4si...

Prove that: `sin 3x + sin 2x -sin x = 4sin x cosfrac(x)(2)cosfrac(3x)(2)`

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. If theta be any real, prove that : sin5 theta= 5sin theta-20 sin^3 the...

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  2. Prove the following: cot x cot 2x -cot 2x cot 3x -cot 3x cot x = 1

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  3. Prove that: sin 3x + sin 2x -sin x = 4sin x cosfrac(x)(2)cosfrac(3x)(2...

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  4. Prove that: (sin 3x + sin x) sin x + (cos 3x -cos x) cos x = 0

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  5. Prove that cos^2 x + cos^2 (x+ pi/3) + cos^2(x- pi/3) =3/2.

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  6. If cos theta = (cos phi-e)/(1-e cos phi), show that : tan frac (theta)...

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  7. Prove that : sin 36^@ sin 72^@ sin 108^@ sin 144^@ =5/16.

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  8. Prove that sin frac (pi)(10)+ sin frac (13 pi)(10)=-1/2.

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  9. Prove that : sin^2 18^@ +cos^2 36^@= 3/4.

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  10. Prove that : sin^2 24^@ -sin^2 6^@= 1/8 (sqrt5-1).

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  11. Prove that sin 18^@ and cos 36^@ are the roots of the equation : 4x^2-...

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  12. Prove that : sin 12^@ sin48^@ sin 54^@=1/8.

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  13. Prove that : sin 6^@ sin 42^@ sin 66^@ sin 78^@ =1/16.

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  14. Prove that cos 6^(@) cos 42^(@) cos 60^(@) cos 78^(@)=1/16 .

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  15. Prove that : 16 cos frac (2pi)(15) cos frac (4pi)(15) cos frac (8pi)(1...

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  16. Prove that : (1+cos frac (pi)(8)) (1+cos frac (3pi)(8)) (1+cos frac ...

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  17. If A+B+C=pi , then, find sin 2A+ sin 2B+ sin 2C.

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  18. If A+B+C=pi , then, find sin 2A+ sin 2B+ sin 2C.

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  19. If A + B + C =pi, prove that : cos 2A + cos 2B -cos 2C= 1-4sin A sin B...

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  20. If A + B + C =pi, prove that : cos 2A - cos 2B + cos 2C= 1-4 sin A co...

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