Question

Calculati valoarea expresiei : E= sin 30 grade × cos 60 grade - tg 45 grade

Answer 1

sin 30 grade = $\frac{1}{2}$
cos 60 grade= $\frac{1}{2}$
tg 45 grade= 1
=> E= $\frac{1}{2} * \frac{1}{2} -1= \frac{1}{4} -1= \frac{1-4}{4} = \frac{-3}{4}$