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Prove that tan70^(@)=2tan50^(@)+tan20^(@...

Prove that `tan70^(@)=2tan50^(@)+tan20^(@)`.

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2014-EXERCISE
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  7. Find from the first principle,the derivative of tan 2x at x=pi/8

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  8. Show that the following statement is true by the method of contraposit...

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  9. Prove the following by contradiciton ."The sum of a rational and an ir...

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  11. For a group of 200 students the mean and S.D of marks obtained by them...

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  12. Prove thatcos^2alpha+cos^2(120^@-alpha)+cos^2(120^@+alpha)=3/2

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  13. Prove that tan70^(@)=2tan50^(@)+tan20^(@).

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  14. Draw the structure of the following: SF4

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  15. state the fundamental theorm of algebra and solve the equation 3x^2-5i...

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  16. How many numbers lying between 100 and 1000 can be formed with the dig...

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  17. If S1,S2...Smdenote the sums of n terms of m numbers of A.P is whose f...

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