calculus

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Can someone explain how find the average rate change for these functions?
1.) f(x)=x^3+1
a (2,3) b.(-1,1)

2.) h(t)= cot t
a. pie/4, 3pie/4 b. pie/6, pie/2

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i don't know how to solve this, i'm so lost. determine the exact value of c cot( 4c- pie/4) + tan ( 2c + pie/4)= 0 please help me!!! THANK YIU