#Solve this for me TRIG
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$sin\theta=\frac{perpendicular}{hypotenuse}$
$cos\theta=\frac{base}{hypotenuse}$
$tan\theta=\frac{perpendicular}{base}=$
in the triangle your perpendicular is AC, base is AB and hypotenuse is BC
use these
and then use inverse of tan, sin and cos in each case to determine the value of theta each time
rev
for eg, if u get $tan\theta=x$ then use arctan $arctan(x)=\theta$