Question

calcule o valor de:
a) 2. cos 45 + 3 . sen 30 ( os pontos são multiplicações)
b)5 .sen 30 - 2. cos 30

Answer 1

a)
$2cos45+3sen30$
$2* \frac{ \sqrt{2} }{2} + 3* \frac{1}{2}$
$\frac{2 \sqrt{2}+3 }{2}$


b)
$5sen30-2cos30$
$5* \frac{1}{2} - 2* \frac{ \sqrt{3} }{2}$
$\frac{5-2 \sqrt{3} }{2}$