OpenStudy (anonymous):

Find the zeros of the function in the interval (-2pi, 2pi) f(x)=1/2 cos 2x

3 years ago
OpenStudy (anonymous):

@coolsday

3 years ago
OpenStudy (anonymous):

help plz

3 years ago
OpenStudy (anonymous):

@sourwing

3 years ago
OpenStudy (anonymous):

There is absolutely no reason to be confused. If you plot this function you will see the answer just before your eyes. If you have a means to plot, then go ahead. If you haven't you can use a web-math-plot-program: Go to http://calc.matthen.com/ and type in your formula (you have to use asterisk to obtain multiplication) 1/2*cos(2*x) and select 'plot'. For -2pi you enter -6.28 and for 2pi you enter 6.28 because pi=3.1415... Now wherever your graph crosses the x-axis that's where you have a zero. Zero meaning: The y-value is zero at this position in x. got it off yahoo

3 years ago
OpenStudy (anonymous):

pi/4, 3pi/4, 5pi/4, 7pi/4

3 years ago
OpenStudy (anonymous):

- pi/4, -3pi/4, -5pi/4, -7pi/4, pi/4, 3pi/4, 5pi/4, 7pi/4 are the solutions

3 years ago