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If 2costheta=x+(1)/(x) then prove that, ...

If `2costheta=x+(1)/(x)` then prove that, `2cos3theta=x^(3)+(1)/(x^(3))`.

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KUMAR PRAKASHAN-TRIGONOMETRIC FUNCTIONS -PRACTICE WORK
  1. Prove that, (sec8theta-1)/(sec4theta-1)=(tan8theta)/(tan2theta)

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  2. Prove that, sin4A=4sinAcos^(3)A-4cosAsin^(3)A

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  3. If 2costheta=x+(1)/(x) then prove that, 2cos3theta=x^(3)+(1)/(x^(3)).

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  4. Find the general solutions of the following equations : 2sintheta+1=...

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  5. Find the general solutions of the following equations : cos3theta=-(...

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  6. Find the general solutions of the following equations : sectheta=sqr...

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  7. Find the general solutions of the following equations : costheta=(-s...

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  8. Find the general solutions of the following equations : sintheta=(1)...

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  9. Find the general solutions of the following equations : costheta=-1

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  10. Find the general solutions of the following equations : sin5theta=(1...

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  11. Find the general solutions of the following equations : sin""(3theta...

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  12. Find the general solution for each of the following equations : 4sin...

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  13. Find the general solution for each of the following equations : tan^...

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  14. Find the general solution for each of the following equations : sin3...

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  15. Find the general solution for each of the following equations : tant...

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  16. Find the general solution for each of the following equations : 4sin...

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  17. Find the general solution for each of the following equations : sin2...

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  18. Find the general solution for each of the following equations : 2cos...

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  19. Find the general solution for each of the following equations : tant...

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  20. Find the general solution for each of the following equations : 2sin...

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