as we know that (sin(x))^2 + (cos(x))^2=1(adsbygoogle = window.adsbygoogle || []).push({});

how about (sin(3x))^2 + (cos(3x))^2 and 5sin(3x)^2 + 6cos(3x)^2??

how can we solve these problems??

thanx

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Solving trigonometric equations

**Physics Forums | Science Articles, Homework Help, Discussion**