\cos {{7\pi}/8}+ \cos {\pi/4} +\cos ({-\pi}/8) -1 =

Correct Answer is : 4cosπ16cos3π8cos9π16

4\cos {\pi/16} \cos{{3\pi}/4} \cos {{5\pi}/8}

4\cos {\pi/16} \cos{{\pi}/8} \sin {{5\pi}/8}

4\cos {\pi/16} \cos{{3\pi}/8} \cos {{9\pi}/16}

-4\cos {\pi/16} \cos{{5\pi}/8} \cos {{\pi}/16}

TS EAMCET 5-Aug-2021 Shift 2 Question Paper

Section: Mathematics

Question : 20 of 160

Marks: +1, -0

cos‌

7π

+cos‌

+cos(

−π

)−1 =

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