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Answer 1 · 2018-01-12T14:21:09

x=0°,180°,360°

#Cos^2x=sin^2x + 1#

(#sin^2x=1 - cos^2#)

#cos^2x=1 - cos^2 + 1#

#cos^2x + cos^2x = 1+1#

#2cos^2x = 2#

#cos^2x = 1#

#cosx = +-1#

This is possible when x=0°,180°,360°

Hope it helps you