Question

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Answer 1

@ganeshie8

Answer 2

plugin t = 9, and evaluate

Answer 3

f(9) = 3cos(pi/6*9) + 5
= 3cos(3pi/2) + 5
= ?

Answer 4

3cos(6.28) + 5
How do I now solve with the cos?

Answer 5

familiar with unit circle ?

Answer 6

cos(3pi/2) = 0

Answer 7

f(9) = 3cos(pi/6*9) + 5
= 3cos(3pi/2) + 5
= 3*0 + 5
= 5

Answer 8

a little; I forgot about that. thank youu!