Math

lim (cos(π/4 + h) - cos (π/4))
h->0 _________________________
h

Somehow I ended up with cos(1).

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  1. lim (cos(π/4 + h) - cos (π/4)) / h
    h->0

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  2. A store bought a toy rocket at a cost of $40 and marked it up 25%. Ronnie bought it and paid 10% sales tax. What was his total cost?

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