1.

Show that sin 8r+ sin 2acos 2x -cos 8x2.cot 3r

Answer»

Sin8x + Sin2x/Cos2x - Cos8x>(2sin(x+y/2)cos(x-y/2))/(-2sin(x+y/2)sin(x-y/2)

>2sin5xcos3x/-2sin3x(-sin5x)>2sin5xcos3x/2sin3xsin5x>Cos2x/sin3x>Cot3x



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