Observe the right triangle figure, the sides are .
(Write alternative form of cosines law)
(Substitute )
(Apply property of exponents)
(Simplify)
(Multiply each side by )
(Use calculator)
(Write reciprocal form of sines law)
(Substitute )
(Multiply each side by 3)
(Use calculator)
(Multiply each side by )
(Use calculator)
In a triangle, the total of three angles is .
(Write total of three angles)
(Substitute )
(Subtract from each side)
The angles are .
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