Trig homework help?
sin^4x – cos^4x = 1-2cos^2x
I can’t plug in a number to prove its right, I have to show how I can make each side equal each other. Simplest form should be 1 = 1. It includes all the random rules of stuff were like sin^2 + cos^2 = 1 and whatnot.
The easier problems I understand, but this is really hard.
Favorite Answer
The right side is a common trig identity (turn the 1 into sin^2+cos^2).
Does that get you started enough?
By the way, those aren’t “random rules of stuff”. They all derive algebraically from the Pythagorean Theorem and the base definitions of sine, tangent, secant, and “co-“something. If you can remember the basic definitions and the derivation methods, you can replace your rote memorization with a few handy techniques to rebuild the entire pantheon of theorems.
- Academic Writing
- Accounting
- Anthropology
- Article
- Blog
- Business
- Career
- Case Study
- Critical Thinking
- Culture
- Dissertation
- Education
- Education Questions
- Essay Tips
- Essay Writing
- Finance
- Free Essay Samples
- Free Essay Templates
- Free Essay Topics
- Health
- History
- Human Resources
- Law
- Literature
- Management
- Marketing
- Nursing
- other
- Politics
- Problem Solving
- Psychology
- Report
- Research Paper
- Review Writing
- Social Issues
- Speech Writing
- Term Paper
- Thesis Writing
- Writing Styles