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Prove that: tan(pi/4+theta)+tan(pi/4-the...

Prove that: `tan(pi/4+theta)+tan(pi/4-theta)=2sec2theta` .

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tan(pi/4+theta)-tan(pi/4-theta)=2tan2theta

sec(pi/4+theta)sec(pi/4-theta)=2sec2theta

Prove that: cos^2(pi/4-theta)-sin^2(pi/4-theta)=sin2theta

Prove that cosec(pi/4+theta/2)cosec(pi/4-theta/2)=2sec theta

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

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

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

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

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS OF MULTIPLE AND SUBMULTIPLE ANGLES-All Questions
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  3. Prove that: tan(pi/4+theta)+tan(pi/4-theta)=2sec2theta .

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  8. If cos x=-3/5a n d\ x lies in IInd quadrant, find the values of sin2x\...

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  10. Prove that 1+cos^2 2theta=2(cos^4theta+sin^4theta)

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  11. If costheta=4/5a n d\ theta is acute, find the t a n2theta

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  12. If sintheta=4/5 and 0ltthetaltpi/ 2, find the value of sin4theta

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  13. Prove that: \ cos7^0cos 14^0cos 28^0cos 56^0=(sin 68^0)/(16cos83^0)

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  14. Prove that: cos(pi/5)cos((2pi)/5)cos((4pi)/5)cos((8pi)/5)=(-1)/16

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  19. If costheta=(cosalpha+cosbeta)/(1+cosalphacosbeta),\ prove that tanth...

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  20. If sec(theta+alpha)+sec(theta-alpha)=2\ s e ctheta, prove that costhet...

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