Question Number 597 by 112358 last updated on 08/Feb/15 $${Evaluate}\:\int_{\mathrm{0}} ^{\mathrm{1}} \frac{\mathrm{1}}{\mathrm{1}+{u}^{\mathrm{4}} }{du}\:{exactly}\:{if}\: \\ $$$${u}={coshx}.\: \\ $$ Commented by prakash jain last updated on 08/Feb/15…