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x = (cos)^-1 (-1)

these are the answer choices
2pik
pi/2 + 2k
pi + 2pik
3pi/2+ 2pik

isn't there k in the equation? which we're supposing as an integer?

i have no idea. i don't even know where to begin :(

hold on.. and check the question again if it is the same u've written?

Find the values of x for which the equation cos x = –1 is true. Let k represent an integer.

I'm gonna go now, will tell u after solving..

thanks