Posted by **Christina** on Thursday, December 2, 2010 at 10:11pm.

I've tried many times to get the equation to balance using trig identities like half-angle formulas, power-reducing formulas, and double angle formulas, but I couldn't get the equation to equal out. I only need to work one side to make it equal to the other, like a kind of proof. Please help!

1 - 4sin^2(x)cos^2(x) = cos^2(2x)

- Precalculus -
**MathMate**, Thursday, December 2, 2010 at 11:09pm
Can you check your book to see if the given expression is "supposed" to be an identity, or is it a question to solve for x?

The left hand side:

4sin²(x)cos²(x)

=(2sin(x)cos(x))²

=sin²(2x)

Which is not an identity with the right hand side.

If it is an equation, try to solve for x. It would be an excellent exercise.

## Answer this Question

## Related Questions

- math - sin2x-cotx = -cotxcos2x Using the various trigonometric identities(i.e. ...
- Math - 1. Power reducing formulas can be used to rewrite 8sin^2 xcos^2 x as 1-...
- MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...
- computer applications - John wants to see the formulas he has used in his ...
- Trig/Precalc - So I have two questions that have been puzzling me for quite some...
- Math - I am stuck on a problem that has to do with the double angle formulas. I ...
- trig - Solving Trig Functions: How Do You Solve For Sin 7.5 Using Half-Angle and...
- Trigonometry - There is an arbitrary triangle with angles A, B, and C and sides ...
- trig - Use half-angle formulas to find the exact value for the following cot 75 ...
- Physics - A track star in the long jump goes into the jump at 12 m/s and ...