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swin2013

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f(x) = tanx a=pi

swin2013

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f'(x) = sec^2x ?

hartnn

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the linear function y is given by
y= f(a) + f'(a) (x-a)
here , a =pi,
f'(x) = sec^2 x
whats f(a) =... ?
just replace 'x' in f(x) by a =pi.
whats f'(a) =... ?
just replace 'x' in f'(x) by a =pi.

swin2013

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f'(pi) = 1?

swin2013

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f(pi) = tan(pi) = 0

swin2013

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L(x) = 0+ 1(x-pi)

hartnn

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absolutely correct!

swin2013

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ohhh ok thanks!!

hartnn

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welcome ^_^