Posted by **Anonymous** on Thursday, November 14, 2013 at 9:48pm.

Solve for all values between zero and 360 degrees.

cos(theta-42 degrees)=-1

What is the general solution and what is the solution????

- Pre calculus -
**Reiny**, Thursday, November 14, 2013 at 10:23pm
cos(Ø - 42°) = -1

I know cos 180° = -1

Ø - 42 = 180

Ø = 222° , only one solution between 0° and 360°

(look at the graph of cos Ø )

The period of cos(Ø-42) is 360°

so a general solution is

Ø = 222° + 360k° , where k is an integer.

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