Respuesta :

Solution

[tex]sin\text{ }a=0.7[/tex][tex]\begin{gathered} sin\text{ a=0.7} \\ a=sin^{-1}0.7 \\ a=44.427^0 \end{gathered}[/tex]

on the second quadrant

[tex]180-44.427=135.572[/tex]

Now cos a

[tex]cos\text{ 135.572=-0.71414}[/tex]

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