need this asap for a test and i don't know how to solve it when it doesn't have an x in the equation

problem is : find the a, b, c ,d of y=25sin(1.3pi+0.4pi*t)+28

i know a is 25

d is 28

how to solve b and c?

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- March 20th 2013, 04:37 AMshanhuawu60474sinusoidal function need help!
need this asap for a test and i don't know how to solve it when it doesn't have an x in the equation

problem is : find the a, b, c ,d of y=25sin(1.3pi+0.4pi*t)+28

i know a is 25

d is 28

how to solve b and c?