Question

calculati cos^2 45 grade +sin ^2 135 grade

Answer 1

[tex]cos^2 45^o + sin^2 135^o = cos^2 45^o + sin^2(180^o-45^o)= \\ \\ =cos^245^o+ sin^2 45^o = 1 \\ \\ \\\boxed{ $ M-am folosit de proprietatile: \left| \begin{array}{c} sin(180^o-x) = sin x \\ sin^2x+cos^2x = 1 \end{array} } [/tex]