Question 877850
Which of the following is a valid trigonometric identities. (only one correct solution)
a. tan(x)+ cot(x) = sin(x)cos(x)
b. tan(2x) + cot(2x) = sec(x)csc(x)
c. tan(2x) + cot(2x) = sin(x)cos(x)
d. tan(x) + cot(x) = sec(x)csc(x)
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tanx+cotx=secxcscx
start with left side:
{{{sin(x)/cos(x)+cos(x)/sin(x)}}}
{{{(sin^2(x)+cos^2(x))/(cos(x)*sin(x))}}}
{{{1/(cos(x)sin(x))=(1/cos(x))(1/sin(x))=sec(x)csc(x)}}}
valid trigonometric identity: d.tan(x)+cot(x)=sec(x)csc(x)