Please find attached the question as you told me to upload.I don't understand why tan(a)=-a/h. Also, I don't understand why v(x,t)=sigma(an(e^-(k(an)^2))t(sinanx).Can you please explain it to me?Thank you.

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Q: Find f. f ''(?) = sin(?) + cos(?),    f(0) = 5,    f '(0) = 2 f(?) =

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A: I am attaching image so that you understand each and every step.