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Category: Limits

Question-178161

Question Number 178161 by mathlove last updated on 13/Oct/22 Commented by CElcedricjunior last updated on 15/Oct/22 limx0cosxcos3x+sin2xax2=00=FItoapplyhospital$$\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\frac{−\boldsymbol{{sinx}}}{\boldsymbol{{a}}\mathrm{2}\boldsymbol{{x}}}+\frac{\mathrm{3}\boldsymbol{{sin}}\mathrm{3}\boldsymbol{{x}}}{\mathrm{2}\boldsymbol{{ax}}}+\frac{\boldsymbol{{sin}}\mathrm{2}\boldsymbol{{x}}}{\mathrm{2}\boldsymbol{{ax}}}…

Question-47070

Question Number 47070 by Meritguide1234 last updated on 04/Nov/18 Commented by maxmathsup by imad last updated on 04/Nov/18 $${let}\:\:{S}\left({x}\right)=\sum_{{n}=\mathrm{0}} ^{\infty} \:\frac{{cos}\left({nx}\right)}{{n}!}\:\Rightarrow{S}\left({x}\right)\:={Re}\left(\sum_{{n}=\mathrm{0}} ^{\infty} \:\frac{{e}^{{inx}} }{{n}!}\right)\:{but} \