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If tanx=3/4,pi<x<(3pi)/2 , fid the value...

If `tanx=3/4,pi

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`180< x <\frac{3}{2} \times 180` `=180< x <270` `=90<\frac{ x }{2}<\frac{270}{2}` `=\frac{\pi}{2}<\frac{ x }{2}<\frac{3 \pi}{4}`

`\sin \frac{x}{2}` is positive. `\cos \frac{x}{2}` is negative. ...
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RD SHARMA-TRIGONOMETRIC RATIOS OF MULTIPLE AND SUBMULTIPLE ANGLES-Solved Examples And Exercises
  1. Show that sqrt(3)\ cos e c\ 20^0-sec20^0=4.

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  2. Prove that: tan4theta=(4t a ntheta(1-tan^2theta))/(1-6tan^2theta+tan^4...

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  3. If tanx=3/4,pi<x<(3pi)/2 , fid the values of sinx/2,cosx/2a n dtanx//2...

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  4. Find : cos 20^0cos 40^0cos 60^0cos 80^0

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  5. Prove that : cos(pi/7)cos((2pi)/7) cos((3pi)/7)=1/8

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  6. Show that: sin 50^0cos85^0=(1-sqrt(2)sin35^0)/(2sqrt(2))

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  7. Prove that cos(2pi/15)cos(4pi/15)cos(8pi/15)cos(14pi/15)=1/16

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  8. sin(pi/18)*sin(5pi/18)*sin(7pi/18)

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  9. cos(pi/15)cos((2pi)/15)cos((3pi)/15)cos((4pi)/15)cos((5pi)/15)cos((6pi...

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  10. If sinalpha+sinbeta=a and cosalpha+cosbeta=b prove that: cos(alpha-bet...

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  11. sinalpha+sinbeta=a ,cosalpha+cosbeta=b=>sin(alpha+beta)

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  12. Prove that sqrt((1-cos2theta)/(1+cos2theta))=tantheta where tantheta>0

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  13. Prove that: (sin2theta)/(1-cos2theta)=cottheta

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  14. Prove that: (sin2theta)/(1+cos2theta)=t a ntheta

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  15. Prove that: \ sqrt(2+sqrt(2+2cos4theta))=2costheta

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  16. (1+sin2theta-cos2theta)/(1+sin2theta+cos2theta)=tantheta

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  17. (sintheta +sin2theta)/(1+costheta+cos2theta)=tantheta

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  18. Prove that: (cos2theta)/(1+sin2theta)=tan(pi/4-theta)

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  19. Prove that: (costheta)/(1+sintheta)=tan(pi/4-theta/2)

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  20. Prove that: sin^2(pi/8)+sin^2((3pi)/8)+sin^2((5pi)/8)+sin^2((7pi)/8)=2

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