1.

If $cos 20^{0}$ = mand $cos 70^{0}$ = n, then the value of $m^{2} + n^{2}$ is1). 12). $\frac{3}{2}$3). $\frac{1}{\sqrt{2}}$4). $\frac{1}{2}$

Answer»

I am not SURE, MAY be 1 is CORRECT



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