Question 981767
a) Period is {{{(2pi)/2=pi}}}
Amplitude is {{{4}}}
b) Max value at {{{x=0+2pi*k}}}
Min value for {{{x=pi/2 + 2pi*k}}}
Zeros at {{{x=pi/4 + 2pi*k}}} and {{{x=(3/4)pi+2pi*k}}}
for all integers k.
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*[illustration fd4.JPG].