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Example 17: Prove that:
sin x -sin 5x + sin 9x -sin 13x
cos x – cos 5x – cos 9x + cos 13x
= cot 4x.
sol​

By Valentina

Example 17: Prove that:
sin x -sin 5x + sin 9x -sin 13x
cos x – cos 5x – cos 9x + cos 13x
= cot 4x.
sol​

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Valentina

3x + 5y + 72 = 12
x – 3y + 4z = 16
9x + 8y +31 z =54
Find the value of x , y and z .

3] Find out the radious of redious of circle if
diameter is 44cm​

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