Hello!
I'm having a really hard time with solving trig equations. Here is one I have been working on and keep getting wrong: cos(2x-pi/2)=-1
I'm told to solve it on the interval [0,2pi].
So far, I have found that 2x-pi/2=pi, because the cos(something)=-1 gives pi. Then I solved for x and got that x=3pi/4. My book also lists 7pi/4 as the answer. I thought it would have been 5pi/4 because if it was originally a problem where cosine was negative. What am I doing wrong?
Thanks!
~Mycroft
I'm having a really hard time with solving trig equations. Here is one I have been working on and keep getting wrong: cos(2x-pi/2)=-1
I'm told to solve it on the interval [0,2pi].
So far, I have found that 2x-pi/2=pi, because the cos(something)=-1 gives pi. Then I solved for x and got that x=3pi/4. My book also lists 7pi/4 as the answer. I thought it would have been 5pi/4 because if it was originally a problem where cosine was negative. What am I doing wrong?
Thanks!
~Mycroft