JEE MAIN - Mathematics Hindi (2022 - 27th June Morning Shift - No. 15)
$$\cos \left(\frac{2 \pi}{7}\right)+\cos \left(\frac{4 \pi}{7}\right)+\cos \left(\frac{6 \pi}{7}\right)$$ का मान बराबर है :
$$-1$$
$$-\frac{1}{2}$$
$$-\frac{1}{3}$$
$$-\frac{1}{4}$$
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