how would I solve tan^-1 (-1)

i also have to do it for sin and cos

thanks

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- Aug 16th 2008, 02:44 PMapmsolve w/o calc inverse of tan -1 and for sin,cos
how would I solve tan^-1 (-1)

i also have to do it for sin and cos

thanks - Aug 16th 2008, 03:06 PMgalactus
Think about it. If $\displaystyle tan(y/x)=1$, then y=x

So, it is a 45 degree angle or Pi/4 radians.