SOLUTION: Evaluate the expression. {{{ cos(-x) }}}{{{ cot(x) }}}{{{ sin(-x) }}} A.) {{{ cos(x) }}} B.) {{{ -cos(x) }}} C.) {{{ cos^2(x) }}} D.) {{{ -cos^2(x) }}}

Question 1058467: Evaluate the expression.

A.)
B.)
C.)
D.)
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!


Memorize the 6 trig ratios for the negative angles:
(only the cosine and secant don't change the sign)

sin(-x) = -sin(x)
cos(-x) = cos(x)
tan(-x) = -tan(x)
sec(-x) = sec(x)
csc(-x) = -csc(x)
cot(-x) = -cot(x)







Use the identity 









Edwin

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