Question

Sendo x = pi/2 , calcule a sabendo que a =sen3x+cos4x-tg2x

Answer 1

substituindo x=pi/2 em a, temos sen3pi/2+cos2.pi-tgpi=-1+1-0=0

Answer 2

$Ol\'{a}$

$Considere \ os \ dados \ abaixo:$

$\pi= 180 \\ 2\pi= 360 \\ \dfrac{3\pi}{2}=270$

$a= sen3x+cos4x-tg2x$

$a= sen3 \ . \ \dfrac{\pi}{2}+ cos4 \ . \ \dfrac{\pi}{2}-tg2 \ . \ \dfrac{\pi}{2}$

$a=sen \dfrac{3\pi}{2}+cos\dfrac{4\pi}{2}-tg\dfrac{2\pi}{2}$

$a=sen \dfrac{3\pi}{2}+cos2\pi-tg\pi$

$a= -1+1+0$

$\bold{\boxed{a=0}}$