Posted by **Anita** on Thursday, January 19, 2012 at 9:08pm.

What value for function y=3cos(t-pi) + 2 gives an instantaneous rate of change of 0?

a) 0

b) pi/2

c) pi/3

d) pi/4

- Math -
**wow**, Thursday, January 19, 2012 at 9:14pm
pi/3

- Math -
**Reiny**, Thursday, January 19, 2012 at 11:17pm
dy/dx = -3 sin(t-π)

=0

sin(t-π) = 0

t-π = 0 , or t-π = π or t-π = 2π

t = ... -3π, -2π, -π , 0 , π, 2π , 3π . .

- Math -
**Anita**, Thursday, January 19, 2012 at 11:33pm
Answer is 0, right?

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