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Prove that cos20^0cos40^0cos60^0cos80^0=...

Prove that `cos20^0cos40^0cos60^0cos80^0=1/(16)dot`

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
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  3. Prove that cos20^0cos40^0cos60^0cos80^0=1/(16)dot

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  13. Show that the line joining the incenter to the circumcenter of triangl...

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  14. For n in Z , the general solution of (sqrt(3)-1)sintheta+(sqrt(3)+1)c...

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  19. The value of sinpi/(14)sin(3pi)/(14)sin(5pi)/(14)sin(7pi)/(14)sin(9pi)...

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  20. If 3sintheta+5costheta=5, then show that 5sintheta-3costheta=+-3.

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