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9.6 Solving Right Triangles Trig Equations sin 72 x 10 Side We find the missing side by cross multiplying. Angle How do we find the missing angle measure? 10 sin B 12 Inverse Trig Functions sin-1x = arcsin x cos-1x = arccos x Read as arcsine or inverse sine Read as arccosine or inverse cosine tan-1x = arctan x Read as arctangent or inverse tangent We use inverse trig functions to find missing angles. Where are these buttons on your calculator? Ex. 1 Solve the trig equation 5 cos A 11 Ex. 2 Solve the trig equation tan B 21 3 Ex 3 Find the missing angles B 3 2 A 13 C Ex 4. Solve the triangle Means find all missing angles and sides C 10 5 A B Ex 5. Solve the triangle Y 25 X Z 13