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Question Number 22102 by Parvez akhter last updated on 11/Oct/17

cosh (15)

$$\mathrm{cosh}\:\left(\mathrm{15}\right) \\ $$

Answered by $@ty@m last updated on 11/Oct/17

cos hx=((e^x +e^(−x) )/2)  cos h(15)=((e^(15) +e^(−15) )/2)  =((e^(15) +(1/e^(15) ))/2)

$$\mathrm{cos}\:{hx}=\frac{{e}^{{x}} +{e}^{−{x}} }{\mathrm{2}} \\ $$$$\mathrm{cos}\:{h}\left(\mathrm{15}\right)=\frac{{e}^{\mathrm{15}} +{e}^{−\mathrm{15}} }{\mathrm{2}} \\ $$$$=\frac{{e}^{\mathrm{15}} +\frac{\mathrm{1}}{{e}^{\mathrm{15}} }}{\mathrm{2}} \\ $$

Commented by $@ty@m last updated on 11/Oct/17

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