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Greatest Integer Function

70. If cosx+c...

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70. If cosx+cos7x+cos3x+cos5x=0 then x= (A)n(pi)/4,n=Z (B)n(pi)/2,n=I (C)n(pi)/8;n+8k,n,z=Z (D)n(pi)/3;n=Z

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z = - 2 + 2 \sqrt{3} i,

z^{2 n} + 2^{2 n} z^{n} + 2^{4 n}

may be equal to

z^{2} - z + 1 = 0

z^{n} - z^{- n}

n

is a multiple of

3

z = c o s θ + i s i n θ

z^{2} - z + 1 = 0,

then possible value(s) of

z^{n} - z^{- n},

n

\sqrt{3} \cos x + \sin x = \sqrt{2}

, then general value of x is
(a)

n π + {(- 1)}^{n} \frac{π}{4}, n \in Z

{(- 1)}^{n} \frac{π}{4} - \frac{π}{3}, n \in Z

n π + \frac{π}{4} - \frac{π}{3}, n \in Z

n π + {(- 1)}^{n} \frac{π}{4} - \frac{π}{3}, n \in Z

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