Posted by **Daniel ** on Sunday, May 22, 2011 at 2:30pm.

cos4x*cos3x + sin4x*sin3x

## Answer This Question

## Related Questions

- Algebra/trigonometry - The expression cos4x cos3x+ sin4x sin3x is equilvalent to...
- math(advanced algebra&trigonometry) - the expression cos4x cos3x + sin4x sin3x ...
- Trig - Simplify: (cosx + cos2x + cos3x + cos4x + cos5x + cos6x) / (sinx + sin2x...
- math - Solve sin2x + sin4x = cos2x + cos 4x for x in the interval[0,2pi) Hint: ...
- trig - how can you confirm the identity cos^4x = (1/8)(3+ 4cos2x+ cos4x) and ...
- Calculus - Evaluate the integral e^x sin4x dx. I know the answer is 1/17 e^x ...
- Trig - help please!: (sinx + sin2x +sin3x) / (cosx + cos2x + cos3x) = tan2x
- Math (Trig) - Rewrite the following expression in terms of tan3x: (sin2x + sin4x...
- Trig identity. - I need help with verifying these trig identities: 1) sin4x = ...
- trig - find all values of x on interval 0-2pi. (sin4x)(cos7x)=(cos4x)(sin7x) ...

More Related Questions