#2**+2 **

Guest troll visits some strange websites.

Do you know where cos(x) = -1 ? This is true at pi radians (or 180 degrees ----same thing)

so cos (pi) = -1

now arcos both sides

arcos ( cos(pi) ) = arcos (-1)

pi = arcos (-1)

ElectricPavlov
Feb 24, 2018

#2**+2 **

Best Answer

Guest troll visits some strange websites.

Do you know where cos(x) = -1 ? This is true at pi radians (or 180 degrees ----same thing)

so cos (pi) = -1

now arcos both sides

arcos ( cos(pi) ) = arcos (-1)

pi = arcos (-1)

ElectricPavlov
Feb 24, 2018