三角関数の公式【一般の三角関数の公式】 sin(-x) = -sin(x) cos(-x) = cos(x) sin(π/2-x) = cos(x), sin(π-x) = sin(x), cos(π/2-x) = sin(x), cos(π-x) = -cos(x), sin(π/2+x) = cos(x), sin(π+x) = -sin(x), cos(π/2+x) = -sin(x), cos(π+x) = -cos(x), sin(x)^2 + cos(x)^2 = 1 加算公式 sin(x+y) = sin(x)cos(y)+cos(x)sin(y), cos(x+y) = cos(x)cos(y)-sin(x)sin(y), 積和公式 2sin(x)cos(y) = sin(x+y) + sin(x-y), 2cos(x)sin(y) = sin(x+y) - sin(x-y), 2cos
