Using Inverse Properties

[nycmathguy]

Section 4.7

Question 46

tan(arctan 45)

Using tan(arctan (t)) = t, the expression given becomes 45.

Question 48

sin(arcsin(-0.2))

Using sin(arcsin (t)) = t, the expression given becomes -0.2.

Question 50

arccos[cos(-3•pi/2)]

cos(-3•pi/2) = 0

arccos(0) = pi/2 or 90°

You say?

 

[MathLover1]

correct

 

[nycmathguy]

correct

Sounds good. Moving on. By the way, no more posting extra stuff in the other forums. I feel like I am overwhelming the site with extra stuff that is not part of my precalculus review. Disregard anything else outside of the current textbook unless I really need help solving a question that I am curious about.