oktw => #ysitd: <licson>: A | \ |_ \ B C sin θ = AB / AC cos θ = BC / AC tan θ = AB / BC sec θ = 1 / cos θ csc θ = 1 / sin θ cot θ = 1 / tan θ sin(A + B) = sin A cos B + cos A sin B cos(A + B) = cos A cos B - sin A sin B tan(A + B) = 我忘記了 #56b74d0256a4af2c7791b460

oktw says to #ysitd

<licson>: A | \ |_ \ B C sin θ = AB / AC cos θ = BC / AC tan θ = AB / BC sec θ = 1 / cos θ csc θ = 1 / sin θ cot θ = 1 / tan θ sin(A + B) = sin A cos B + cos A sin B cos(A + B) = cos A cos B - sin A sin B tan(A + B) = 我忘記了

at Sun, Feb 7, 2016 9:56 PM