1.

`int(tan x)/((sec x + cos x))dx` का मान ज्ञात कीजिए।

Answer» दिया है - `I = int(tanx)/((sec x+cos x))`
` = int(sin)/((1+cos^(2)x))dx`
यदि `cosx = t ` व `sin xdx = dt`
अब `I = - int(1)/((1+t^(2)))dt = - tan^(-1)t +c`
` = - tan^(-1)(cos x)+c`


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