Question #8537b
1 Answer
May 27, 2017
-0.75
Explanation:
By considering the trigonometric identity,
#sin^2(x)+cos^2(x)=1#
#0.6^2+cos^2(x)=1#
#cos(x)=+-0.8#
By considering the CAST rule, because
By considering the CAST rule,
Therefore