Question

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Answer 1

Sin^2x/(1+ cos^2x)

d( sin^2x)/dx .( 1+ cos^2x) - d( 1+ cos^2x)/dx . sin^2x )/ ( 1+ cos^2x)^2

2 sinx cos x ( 1+ cos^2 x) + 2 cos x sin x . sin^2x )/ ( 1+ cos^2 x)^2

Sin 2x ( 1 + cos^2 x + sin^2 x) /( 1+ cos^2x)^2

Sin 2x( 1+ 1)/(1+ cos^2x)^2

2 sin2x/( 1+ cos^2x)^2

Answer 2

Step-by-step explanation:

hope it will helps u

i) see first attachment

ii)see second attachment