A) 1
B) -1
C) 0
D) 2
Correct Answer: D
Solution :
\[{{\sin }^{2}}\frac{\pi }{8}+{{\sin }^{2}}\frac{3\pi }{8}+{{\sin }^{2}}\frac{5\pi }{8}+{{\sin }^{2}}\frac{7\pi }{8}\] \[={{\sin }^{2}}\frac{\pi }{8}+{{\sin }^{2}}\frac{3\pi }{8}+{{\sin }^{2}}\frac{3\pi }{8}+{{\sin }^{2}}\frac{\pi }{8}\] \[=2\left( {{\sin }^{2}}\frac{\pi }{8}+{{\sin }^{2}}\frac{3\pi }{8} \right)=2\times 1=2\].
You need to login to perform this action.
You will be redirected in
3 sec
