Question

Calcula los valores que se piden sí Alfa es un ángulo agudo ​

Answer 1

usando indentidades trigonometricas
sen(a±b)= sena.cosb ±cosa.senb
cos(a±b) = cosa.cosb ± sena.senb
Explicación paso a paso:
a) sen (180°-∝)= sen180°cos∝-cos180°.sen∝
= 0.cos∝-(-1)sen∝
= sen∝ = 0.64
b) cos (90°-∝) = cos90°cos∝-sen90°sen∝
=0.cos∝-1.sen∝
= -sen∝ = -0.64
c) sen(-∝)= - sen∝ = -0.64
d) sen (180°+∝)= sen180°cos∝+cos180°.sen∝
= 0.cos∝+(-1)sen∝
= sen∝ = -0.64