यदि `y = ( sin x) /( 1+ cos x) ` तो सिद्ध कीजिए कि

Explanation

दिया है , ` y = ( sin x)/( 1+ cos x)`
` dy/dx = (( 1+ cos x) . cos x - sin x ( - sin x))/( 1+cos x)^(2)`
` = ( cos x + ( cos^(2) x+ sin^(2)x))/( 1 + cos x)^(2)`
` = ( cos x + 1)/( 1+ cos x)^(2) " " [ :' cos^(2) x + sin^(2) x = 1 ]`
` = 1/( 1+ cos x ) `