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Prove that:(sec8theta-1)/(sec4theta-1)=(...

Prove that:`(sec8theta-1)/(sec4theta-1)=(tan8theta)/(tan2theta)`

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS OF MULTIPLE AND SUBMULTIPLE ANGLES-All Questions
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  3. Prove that:(sec8theta-1)/(sec4theta-1)=(tan8theta)/(tan2theta)

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  8. Show that: sqrt(2+sqrt(2+sqrt(2+2cos8theta)))=2costheta,0<theta<pi 8<=...

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  10. If tan(pi/4+theta/2)=tan^3(pi/4+alpha/2) then sin(theta)=(sin(alpha)(...

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  11. If sin(theta+alpha)=a, a n dsin(theta+beta)=b , prove that cos2(alpha-...

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  12. Prove that: t a nalpha+2tan2alpha+4tan4alpha+8cot8alpha=cotalpha

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  14. If costheta=cosalphacosbeta , prove that t a n(theta+alpha)/2t a n(th...

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  15. If t a ntheta/2=sqrt((a-b)/(a+b))tanvarphi/2 , prove that costheta=(a ...

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