Solve for x.

Maple gave 60, 120, 150 & -150 degrees as the answers.

I tried to find a solution but in vain.

Printable View

- Oct 12th 2013, 09:20 AMKalodaVERY HARD Trigonometric Equation!!

Solve for x.

Maple gave 60, 120, 150 & -150 degrees as the answers.

I tried to find a solution but in vain. - Oct 12th 2013, 10:35 AMphys251Re: VERY HARD Trigonometric Equation!!
1. Use an identity to deal with sin(2x).

2. Use as much algebra as you can. - Oct 12th 2013, 11:42 AMKalodaRe: VERY HARD Trigonometric Equation!!
- Oct 12th 2013, 11:52 AMShakarriRe: VERY HARD Trigonometric Equation!!
After using an identity for sin(2x) bring all the terms with to one side of the equals sign and then square both sides. The identity will be helpful later.

- Oct 12th 2013, 11:59 AMKalodaRe: VERY HARD Trigonometric Equation!!
haha. THanks. Got it ... I didn't tried that one bcoz I proceeded to more complex solution quickly.

- Oct 12th 2013, 05:50 PMSorobanRe: VERY HARD Trigonometric Equation!!
Hello, Kaloda!

Quote:

We have: .

Then: .

. . . . . .

Factor: .

Factor: .

Therefore:

. .

. .