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Home > PC > Chapter 4 > Lesson 4.1.1 > Problem 4-8

4-8.
  1. Given the equation s2 + c2 = 1, simplify each of the following expressions. Homework Help ✎

    1. c2 + s2

    2. 1 − c2

    3. 1 − s2

    4. s + c

    5. 4(1 − s2)

    6. 4 − 4s2

Rewrite the given equation in its various forms.
Substitute the appropriate expressions in the problems below.

s2 = 1 − c2
c2 = 1 − s2

This is the same as: s2 + c2

This cannot be further simplified.

Factor out a 4 first. Then substitute an expression for s2.