cos square pi by 8+ cos square 2pi by 8+ cos square 5by 8 + cos square 7 pi by 8
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Pi=180 degree
cos²pi/8+cos²2pi/8+ cos²5pi/8+ cos²7pi/8
=(-1/8)²+(-2/8)²+(-5/8)²+(-7/8)²
=1/64+4/64+25/64+49/64
=79/64
cos²pi/8+cos²2pi/8+ cos²5pi/8+ cos²7pi/8
=(-1/8)²+(-2/8)²+(-5/8)²+(-7/8)²
=1/64+4/64+25/64+49/64
=79/64
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