Solve cos x = -1/2
cos(x)=1/2 を解く(すべての解):度
Solve cos x = 1/2
半数恒等式を用いて、cos(x) = 1/4 かつ x が (0, pi/2) 内にある場合の cos(x/2) の正確な値を求める
Find the values of other five trigonometric ratios: cos x = -1/2, x lies in third quadrant
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