1.

इन समक़लानो का मान ज्ञात कीजिएः `int_(0)^(pi) (sin^(2)""(x)/(2)-cos^(2)""x/2)dx`

Answer» `underset(0)overset(pi)int(sin^(2)""x/2-cos^(2)""x/2)dx`
`=-underset(0)overset(pi)int (cos^(2)""pi/2-sin^(2)""x/2)dx`
`=-underset(0)overset(pi)int cosx=-[sinx]_(0)^(x)`
`=-[sin pi-sin 0]=0`


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