Challenging Trigonometry.

Geometry Level 3

The value of sin ⁡ 7 8 ∘ − sin ⁡ 6 6 ∘ − sin ⁡ 4 2 ∘ + sin ⁡ 6 ∘ \sin 78^\circ -\sin 66^\circ-\sin 42^\circ + \sin 6^\circ can be represented in the form of − a b - \frac{a}{b} where a and b are positive coprime integers.Find a + b a+b .


The answer is 3.

Yash Singhal by Yash Singhal , 22, India

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1 solution

Ahmad Saad
Mar 9, 2016

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