Find the value of the expression cos4π8+cos43π8+cos45π8+cos47π8 Or

1.	Find the value of the expression cos4π8+cos43π8+cos45π8+cos47π8 Or Find the value of sinx2, cos x2 and tan x2, if sin x=14, where x lies in ssecond quadrant.
Answer» Find the value of the expression $c o s^{4} \frac{π}{8} + c o s^{4} \frac{3 π}{8} + c o s^{4} \frac{5 π}{8} + c o s^{4} \frac{7 π}{8}$ Or Find the value of $s i n \frac{x}{2}, c o s \frac{x}{2}$ and $t a n \frac{x}{2}$ , if $s i n x = \frac{1}{4}$ , where x lies in ssecond quadrant.

Find the value of the expression cos4π8+cos43π8+cos45π8+cos47π8 Or Find the value of sinx2, cos x2 and tan x2, if sin x=14, where x lies in ssecond quadrant.

Answer»

Find the value of the expression $c o s^{4} \frac{π}{8} + c o s^{4} \frac{3 π}{8} + c o s^{4} \frac{5 π}{8} + c o s^{4} \frac{7 π}{8}$

Find the value of $s i n \frac{x}{2}, c o s \frac{x}{2}$ and $t a n \frac{x}{2}$ , if $s i n x = \frac{1}{4}$ , where x lies in ssecond quadrant.