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Sagot :
Step-by-step explanation:
no calculator req
cos 60 is 0.5
so cos inverse of 0.5 os 60°
[tex]\\ \tt\hookrightarrow cos^{-1}(0.5)[/tex]
[tex]\\ \tt\hookrightarrow cos^{-1}\left(\dfrac{1}{2}\right)[/tex]
[tex]\\ \tt\hookrightarrow 60°[/tex]
Fact about cosine(cos)
[tex]\\ \tt\hookrightarrow cos\theta=\dfrac{Base}{Hypotenuse}[/tex]
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