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

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

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. Prove that tan(pi/16)+2tan(pi/8)+4=cot (pi/16) .

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  2. Show that sqrt[2+sqrt[2+2cos4theta]]=2costheta

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

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  4. If sinalpha+sinbeta=a and cosalpha+cosbeta=b , prove that tan((alpha...

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

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  7. If pi < x < 2pi, prove that (sqrt(1+cosx)+sqrt(1-cosx))/(sqrt(1+...

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

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  10. Prove that sqrt(sin^4x+4cos^2x)-sqrt(cos^4x+4sin^2x)=cos2xdot

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  11. If cos^2A+cos^2B+cos^2C=1, t h e n ABC is (a)equilateral (b) isoscele...

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  12. Number of triangles A B C if tanA=x ,tanB=x+1,a n dtanC=1-x is

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  13. Which of the following quantities are rational? (a)sin((11pi)/(12))sin...

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  14. If log(10)sin x + log(10)cos x=-1 and log(10)(sin x + cos x)=((log(10)...

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  18. In a triangle PQR, ∠R=π/2.If tan(P/2) & tan(Q/2), are the roots of the...

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  20. In A B C , if sin^3theta=sin(A-theta)sin(B-theta)sin(C-theta) , then ...

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