Sunday

August 31, 2014

August 31, 2014

Posted by **Hannah** on Wednesday, February 10, 2010 at 4:41pm.

a) sec Q = 2

-pi/3 and 60 degrees

Is this correct?

b) sec Q = -2

This one I do not know how to find.

- Pre-cal -
**Reiny**, Wednesday, February 10, 2010 at 5:03pmI will do the second one.

The first thing I do is to change the expression into one of the 3 basic trig ratios.

sec Q = -2 -----> cos Q = -1/2

I then find the "angle in standard position", which is the angle it the first quadrant.

You have to know your 30-60-90 and your 45-45-90 ratio of sides.

we know cos 60º = 1/2

From the CAST rule, I know that the cosine is negative in quadrants II and III

so Q = 180 - 60 = 120º (quadrant II)

or

Q = 180 + 60 = 240º (qudrant III)

of course in radians that would be 2pi/3 and 4pi/3

Now redo the first one, you are missing an angle. (where else is the cosine positive ?)

**Related Questions**

Math - 1) Find two values of Q that satisfy the equation. Give your answer is ...

math(please help) - 1) Find two values of o that satisfy the equation. Give your...

Pre-Cal - Find the values of Q in degrees and radians without the aid of a ...

Pre-calculus - Find the values of x in the interval 0<=x<360 that satisfy ...

Pre-Cal - use a graphing calculator to obtain the graph of the function. What ...

Trig - Find two values of theta that satisfy the equation. give your answers in ...

Calculus PLEASE check my work , - 1.) which of the following represents dy/dx ...

Calculus 12th grade (double check my work please) - 1.) which of the following ...

Pre-cal - Convert from DMS to Radians 1) 61degree 24' 2) 75degree 30' Convert ...

calculus - The problem is to evaluate the integral 10secxtanx dx, from -1/7 pi ...