Practicing Success
If A = 30°, what is the value of: $\frac{\left[8 \sin A+11 cosec \mathrm{A}-\cot ^2 A\right]}{10 \cos 2 A}$ ? |
$5 \frac{1}{5}$ $4 \frac{3}{5}$ $4 \frac{2}{5}$ $3 \frac{4}{5}$ |
$4 \frac{3}{5}$ |
$\frac{\left[8 \sin A+11 cosec \mathrm{A}-\cot ^2 A\right]}{10 \cos 2 A}$ = \(\frac{8 × sin 30º + 11 cosec 30º - cot2 30º }{10 cos 60º }\) = \(\frac{8 × sin 30º + 11 cosec 30º - cot2 30º }{10 cos 60º }\) = \(\frac{8 × 1/2 + 11 × 2 - (√3)2 }{10× 1/2 }\) = \(\frac{23}{5}\) = 4\(\frac{3}{5}\) |