Class 10 Maths

If sin A = $\frac{3}{4}$ , calculate sec A
$\sin^2 60^{\circ} + 2 \tan 45^{\circ} – \cos^2 30^{\circ} $
$ \frac{1}{a},\frac{3 - a}{3a},\frac{3 - 2a}{3a} ... (a \ne 0)$
Find the nature of roots of the quadratic equation $2x^2 – 4x + 3 = 0$
If HCF (336, 54) = 6, find LCM (336, 54)