hitunglah sin 150 derajat cos 120 derajat + tan 225 derajat sin 45 butuh cepat

[tex] \frac{1}{2} \sqrt{3} .( - \frac{1}{2} ) + 1. \frac{1}{2} \sqrt{2} \\ = - \frac{1}{4} \sqrt{3} + \frac{1}{2} \sqrt{2} \\ = \frac{1}{2} \sqrt{2} - \frac{1}{4} \sqrt{3} [/tex]