Ask questions and get helpful answers.

Multiply then use fundamental identities to simplify the expression below and determine which of the following is not equivalent (2 - 2cos x)(2 + 2cos x)

a.4 - 4cos^2 x
b . 4 - cos^2 x
c.4/(1 + cot^2 x)
d. 4sin^2 x
e.4/(csc^2 x)

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
1 answer
  1. recall that (a-b)(a+b) = a^2-b^2
    so, 2^2 - (2cosx)^2 = 4 - 4cos^2x = 4(1-cos^2x) = 4sin^2x

    only B is not equivalent to that

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Answer this Question

Related Questions

Still need help?

You can ask a new question or browse existing questions.