Convert this identity to one using sine terms only ! 1-2 cos^2 r= a. -1-sin^2r b. 2sin^2r-1 c. 1-2sin^2t explain!

option B is correct.

Step-by-step explanation:

Given the expression:                      ......[1]

Using trigonometric identities:

We can rearrange this as;

     ......[2]

Substitute equation [2] into [1] we get;

Using distributive property:  

or

therefore, the given expression in terms of sine terms is;

answer: ouch. thats difficult

step-by-step explanation:

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0