lim (cosx-sinx)/cos2x x→π/4
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lim(cosx-sinx)/cos2xx→π/4lim(cosx-sinx)/cos2xx→π/4lim(cosx-sinx)/cos2xx→π/4(cosx-sinx)/cos2x=(cosx-s
lim (cosx-sinx)/cos2x x→π/4
lim (cosx-sinx)/cos2x x→π/4
lim (cosx-sinx)/cos2x x→π/4
(cosx-sinx)/cos2x=(cosx-sinx)/(cos^2x-sin^2x)=1/(sinx+cosx)
lim (cosx-sinx)/cos2x x→π/4=√2/2
lim(sinx+cosx)/x,x趋近于无穷
lim (cosx-sinx)/cos2x x→π/4
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