The first equation is

I tried solving it:

But the book says it's

The second equation looks more simple and I can solve it with my calculator but I want to know how to solve it without my calculator

Thank you

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- Dec 17th 2010, 07:09 AMklik11Two sinus equations
The first equation is

I tried solving it:

But the book says it's

The second equation looks more simple and I can solve it with my calculator but I want to know how to solve it without my calculator

Thank you - Dec 17th 2010, 07:29 AMProve It
You have gotten to . You need to remember that sine is negative in the third and fourth quadrants.

So your solutions are .

For the second, if .

So if

. - Dec 21st 2010, 04:37 PMArchie Meade