Mathematics
Senior High
-π≦x≦πの範囲で解くとなぜ、x=-4分の3π、4分のπになるのでしょうか。
解
2曲線の交点のx座標は, 方程式 sinx = COSx の解であり、
05()\
≦x≦πの範囲で解くと
3
π,
4
x=
-
π
4
y=cosx
3
4
π
y
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