Prove that: `s in" "x" "+" "s in" "3x" "+" "s in" "5x" "+" "s in" "7x" "=" "4" "cos" "x" "cos" "2x" "s in" "4x`

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Prove that: sin x + sin 3x + sin 5x + sin 7x= 4 cos x cos 2x sin 4x

Prove that sin x + sin 3x + sin 5x + sin 7x=4 sin 4x cos 2x cos x.

Prove that: (s in5x-2s in3x+s in x)/(cos5x-cos x)=tan x

Prove that (sin 4x + sin 2x)/(cos 4x + cos 2x) = tan 3x .

Prove that (sin x + sin 3x + sin 5x + sin 7x)/(cos x + cos 3x + cos 5x + cos 7x ) = tan 4x

show that sin x+sin 3x +sin 5x +sin 7x =4 sin 4x cos 2x cos x .

Prove that: ((sin 7x + sin 5x) + (sin 9x + sin 3x))/((cos7x + cos5x) + (cos9x + cos 3x))=tan 6x

prove that ((sin 7x + sin 5x )+( sin 9x + sin 3x ))/( ( cos 7x + cos 5x )+ ( cos 9x + cos 3x )) = tan 6x

Prove : (sin 7x +sin 3x)/(cos 7x+cos 3x) = tan 5x

Prove that: s in3x+s in2x-s in x=4s in x(cos x)/(2)(cos(3x))/(2)