sin(α±β) = sin α cos β ± cos α sin β cos 2θ = cos 2 θ − sin 2 θ = 2 cos 2 θ − 1 = 1 − 2 sin 2 θ \(\frac{...sin(α±β) = sin α cos β ± cos α sin β cos 2θ = cos 2 θ − sin 2 θ = 2 cos 2 θ − 1 = 1 − 2 sin 2 θddxsec x = tan x sec x ∫dxa2−x2 = 12a ln|x+ax−a|∫√a2−x2 dx = x2√a2−x2+a22sin−1xa
sin(α±β) = sin α cos β ± cos α sin β cos 2θ = cos 2 θ − sin 2 θ = 2 cos 2 θ − 1 = 1 − 2 sin 2 θ \(\frac{...sin(α±β) = sin α cos β ± cos α sin β cos 2θ = cos 2 θ − sin 2 θ = 2 cos 2 θ − 1 = 1 − 2 sin 2 θddxsec x = tan x sec x ∫dxa2−x2 = 12a ln|x+ax−a|∫√a2−x2 dx = x2√a2−x2+a22sin−1xa