Simplify Trigonometric Expressions...3

[nycmathguy]

Section 5.1

Question 21

tan^2 x - tan^2 x• sin^2 x

tan^2 x(1 - sin^2 x)

tan^2 x(cos^2 x)

I know that tan^2 x = sin^2 x/cos^2 x.

[sin^2 x/cos^2 x](cos^2 x)

Answer: cos^2 x

Yes?

 

[MathLover1]

here

.......cancel cos^2( x)

=sin^2( x)

 

[nycmathguy]

here

.......cancel cos^2( x)

=sin^2( x)

I forgot to cancel cos^2 x.