Question

(sin 90?+cos 60?+ cos 45?)?( sin 30?- cos 0?+cos 45?) find the value

Answer 1

$$\begin{gathered} DearStudent \\ Assumingthequestionas \\ (\sin 90+\cos 60+\cos 45)\times (\sin 30-\cos 0+\cos 45) \\ (1+\frac{1}{2}+\frac{1}{\sqrt{2}})(\frac{1}{2}-1+\frac{1}{\sqrt{2}}) \\ \left(\frac{2\sqrt{2}+\sqrt{2}+2}{2\sqrt{2}}\right)\left(\frac{\sqrt{2}-2\sqrt{2}+2}{2\sqrt{2}}\right) \\ \frac{(3\sqrt{2}+2)(2-\sqrt{2})}{(2\sqrt{2}{)}^2}=\frac{6\sqrt{2}-6+4-2\sqrt{2}}{8}=\frac{-2+4\sqrt{2}}{8}=\frac{2\sqrt{2}-1}{4} \\ Regards \end{gathered}$$