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1.

y=a*sin(bx+c)



amplitude a=3


periodicity of sin is 2pi

period=periodicity/|b|..........in your case b=1

period=2pi/|1|=2pi


2.

amplitude a=3/4


periodicity of sin is 2pi

period=periodicity/|b|..........in your case b=1/2

period=2pi/|1/2|=4pi



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