Question bank/JEE Main/Mathematics

JEE MainMathematicsModerateTrigonometry

If the value of sin10∘sin70∘sin50∘sin10^{\circ}sin70^{\circ}sin50^{\circ} is
equal to K then 
1K\frac{1}{K} is equal to

Show answer and solution
sinAsin(60∘−A)sin(60∘+A)=14sin3AsinAsin\left( 60^{\circ} - A \right)sin\left( 60^{\circ} + A \right) = \frac{1}{4}sin3A

Source: Grass-G / M-18 Mathematics Paper 27 Nov Third.docx

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