Basic Trigonometry

Geometry Level 2

sin ⁡ 9 8 ∘ \sin98^\circ is equal to which of the following numbers?

cos ⁡ 7 2 ∘ \cos72^\circ sin ⁡ 8 ∘ \sin8^\circ csc ⁡ 7 2 ∘ \csc72^\circ sin ⁡ 8 2 ∘ \sin82^\circ

Hritesh Mourya by Hritesh Mourya , 21, India

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1 solution

Ashish Menon
Jul 9, 2016

sin ⁡ 98 ° = ( 180 − 82 ) ° = + sin ⁡ 82 ° \sin {98}^° = \si{(180 - 82)}^° = \color{#3D99F6}{\boxed{\color{#20A900}{+} \sin {82}^°}} . (Sine is positive in second quadrant).

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