Question

em cada item, caso exista, determine a medida do ângulo alfa para que:

Answer 1

$a) \\ cos \alpha = \frac{ \sqrt{3} }{2} ~~ no~~ 2^{\circ}~~quadrante \\ \\ \alpha =30^{\circ} \\ \\ b) \\ sen \alpha =- \frac{1}{2} ~~ no~~4^{\circ}~~quadrante \\ \\ \alpha =-30^{\circ} \\ \\ c) \\ cos \alpha =-1~~~~ no~~eixo~~~x \\ \\ \alpha = \pi =180^{\circ} \\ \\ d) \\ sen \alpha = \frac{ \sqrt{2} }{2} ~~~~ no~~2^{\circ}~~quadrante \\ \\ \alpha =45^{\circ}~~~no~~1^{\circ}~~quadrante \\ \\( 180-45=135) \\ \\ \alpha =135}^{\circ}~~ no~~2^{\circ}~~quadrante$