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so given is that cos x + cos 2 X + Cos 3 X + cos4x is equal to 0.
now , cos90 is equal to 0
so ,cos x + cos2x + cos 3x + cos 4x = cos 90.
x+ 2x+ 3x+ 4x = 90
so , x = 9 hope it help
now , cos90 is equal to 0
so ,cos x + cos2x + cos 3x + cos 4x = cos 90.
x+ 2x+ 3x+ 4x = 90
so , x = 9 hope it help
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