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## Main Question or Discussion Point

Can any one give any hint to solve this ?

If sinx + sin

then , cos

(a) 1

(b) 4

(c) 2

(d) 3

If sinx + sin

^{2}x + sin^{3}x = 1,then , cos

^{6}x - 4cos^{4}x + 8cos^{2}x =(a) 1

(b) 4

(c) 2

(d) 3