How do you evaluate cos(135)?
1 Answer
Jul 1, 2018
Explanation:
#cos135^@=-cos(180-135)^@=-cos45^@#
#-cos45^@=-1/sqrt2xxsqrt2/sqrt2=-sqrt2/2#
#cos135^@=-cos(180-135)^@=-cos45^@#
#-cos45^@=-1/sqrt2xxsqrt2/sqrt2=-sqrt2/2#