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Prove that: cos3x=4cos^(3)x-3cosx...

Prove that: `cos3x=4cos^(3)x-3cosx`

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OSWAAL PUBLICATION-SAMPLE PAPER 2-EXERCISE
  1. If X and Y are two sets such that X ∪ Y has 18 elements, X has 8 eleme...

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  2. Find the value of sin((31pi)/(3)).

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  3. Prove that: cos3x=4cos^(3)x-3cosx

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  4. Show that (-1,2,1),(1,-2,5),(4,-7,8) and(2,-3,4) are the vertices of p...

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  5. Express ((3+sqrt2i)(3-sqrt2 i))/((5-2i)-(5+2i)) in the form of a+ib.

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  6. The marks obtained by a student of Class XI in first and second termin...

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  7. Find the equation of the line, which makes intercepts -3 and 2 on X an...

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  8. Find the equation of the line passing through (-3, 5) and perpendicula...

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  9. Evaluate:underset( x rarr 0)lim (ax+xcos x)/(b sin x).

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  10. Write the contrapositive and converse of "If a paralleogram is a squar...

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  11. Two series A and B with equal means standard deviation 9 and 10 respe...

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  12. A coin is tossed 3 times.Events A and B are, A: no head appears,B:No t...

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  13. In a survey it was found that 21 people liked product A, 26 liked prod...

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  14. If A={1,2,3,4},B={5,6}.Define a relation R from A to B by R={(x,y):x i...

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  15. If sin x = 3/5, cos y =- (12)/(13), where x and y both lie in second q...

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  16. Convert (1+isqrt3)/2 into polar form.

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  17. 27x^(2) - 10x +1=0

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  18. Find the number of arrangements of the letters of the word PERMUTATION...

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  19. In how many ways can the letters of the word 'PERMUTATIONS ' be arrang...

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  20. Expand(x^2+(3/5))^5,x ne 0.

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