CUET Preparation Today
3 sinA - 4 sin3 A = ? |
cot3A sin3A cos3A tan3A |
sin3A |
3 sinA - sin³A Put A = 30º = 3 sin30º - sin³30º = 3 × \(\frac{1}{2}\) - 4 × (\(\frac{1}{2}\))³ = \(\frac{3}{2}\) - \(\frac{1}{2}\) = \(\frac{2}{2}\) = 1 By putting same value of A in all 4 options. Now, sin3A = sin 3 × 30º = sin90º = 1 Ans:- sin3A |
