How do i solve this equation?

sin(2x) = -(sqrt(2))/2

x = ___ ?

------------------

i think i have to use: sin(2x) = 2sinxcosx

Printable View

- Dec 6th 2010, 08:50 PMvecomaTrigonometry Identities? Please Help.
How do i solve this equation?

sin(2x) = -(sqrt(2))/2

x = ___ ?

------------------

i think i have to use: sin(2x) = 2sinxcosx - Dec 6th 2010, 08:52 PMdwsmith
- Dec 7th 2010, 08:23 AMSoroban
Hello, vecoma!

Quote:

How do i solve this equation?

. .

From your basic trig values, you should know that:

. . the angle whose sine is

. .

- Dec 7th 2010, 09:35 AMArchie Meade