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The value of (cos ^(6)5^(@)-15 cos ^(4) ...

The value of `(cos ^(6)5^(@)-15 cos ^(4) 5^(@) sin ^(2)5^(@)+15 cos ^(2)5^(@)sin ^(4) 5^(@)-sin ^(6)5^(@))` is equal to-

A

`-(1)/(sqrt2)`

B

`(sqrt3)/(2)`

C

`(1)/(sqrt2)`

D

1

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The correct Answer is:
B
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CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 9
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  2. if tan x =b/a, then (sqrt((a+b)/(a-b))+sqrt((a-b)/(a+b))) is equal to-

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  3. The complex number z is is such that |z| =1, z ne -1 and w= (z-1)/(z+1...

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  5. The product [32. (32)^(1//6). (32) ^(1//36). ..o] is equal to-

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  6. If a, b, c are distinct positive rational numbers and they are in A.P....

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  7. If the pth, qth and rth terms of a G.P. are again in G.P., then p, q, ...

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  8. 10 boys and 6 girls are arranged in a row, the number of arrangement i...

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  9. If i= sqrt(-1) then the value of sqrti is-

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  10. The sm of numjbers lying between 107 and 253 and divisible by 5 is-

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  11. The coefficient of x ^(24) in (1+ x^(2)) ^(12)(1+ x^(12))(1+ x ^(24)) ...

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  12. If the sum of squares of the diviations of 10 observations taken from ...

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  13. If omega is a complex cube root of unity, then the value of (2-omega) ...

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  14. If the coefficient of x^(7) in (ax ^(2) +(1)/(bx)) ^(11) equals the c...

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  16. In the Argand diagram, OAP is an isosceles right angled triangle, righ...

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  17. The real part of (1+ cos ""pi/5 + i sin ""pi/5)^(-1) is-

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  18. The valud of [15^(2)+16^(2)+17^(2)+…+ 30^(2)] is-

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  19. 5 boys and 5 girls are sitting in a row randomly. The probability that...

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  20. If x in RR and (x)/(2x+1) ge 1/4, state which of the following is true...

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  21. The value of (""^(20) C(4) +2* ""^(20)C(3)+""^(20)C(2) -""^(22)C(18)) ...

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