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Show tha: cos6A=32cos^6A-48cos^4A+18cos^...

Show tha:
`cos6A=32cos^6A-48cos^4A+18cos^2A-1`

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  • MODEL PAPER (11)

    JBD PUBLICATION|Exercise EXERCISE|39 Videos

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Prove that : cos A cos 2A cos 2^2 A cos 2^3 A........ cos 2^(n-1) A= (sin 2^n A)/(2^n sinA) .

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If A + B + C =pi , prove that : cos 4A + cos 4B + cos 4C =-1+4 cos 2A cos 2B cos 2C .

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JBD PUBLICATION-MODEL PAPER (12)-EXERCISE
  1. Find the component statement of the following and check whether they a...

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  2. Let A={a,b,c} and B={1,2,3}. Find the number of relations from A into ...

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  3. Show tha: cos6A=32cos^6A-48cos^4A+18cos^2A-1

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  4. 1^2+2^2+3^3+.....+n^2=(n(n+1)(2n+1))/(6)

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  5. If ^nC3=56 and ^nP3=336, find n .

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  6. The English alphabet has 5 vowels and 21 consonants. How many words wi...

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  7. The sum of two numbers is 6 times their G.M. show that numbers are in ...

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  8. Between 1 and 31, n A.M's have been inserted in sucha a way that the r...

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  9. In which ratio is the line joining the points (1,3) and (2,7) is divid...

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  10. Find the equation of hyperbola whose foic are (0, pm12) and length of ...

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  11. Evaluate:underset(xrarr0)lim (1-cos2x)/(3tan^2x)

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  12. Differentiate: (acos x+bsinx+c)/(sinx) w.r.t.x.

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  13. Three coins are tossed once. Find the probability of getting at least ...

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  14. Three coins are tossed once. Find the probability of getting at most t...

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  15. If (x + iy)^3 = u + iv, then show that u/x +v/y = 4(x^2 - y^2)

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  16. Find the square root fo 1 - i.

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  17. Find all pairs of consecutive odd positive integers both of which are ...

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  18. Solve the given inequality -5 < (x - 2)/5 le 0

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  19. Find underset(xrarr0)f(x) where f(x)={(2x+3, xle0),(3(x+1), x>0):}

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  20. Find the derivative of (sin x + cos x) from the first principle.

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