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Core 3 Maths Differentiation - finding gradient of tangent given x coord

[problem solved]

Hi

On this Q I needed to differentiate a trig function which I did, and find the gradient given a point. However my answer is not what the book's answer is - can someone help me spot what I did wrong?

(Question, my answer and actual answer on image)

image.jpeg
(edited 7 years ago)
Original post by Yusufff
Hi

On this Q I needed to differentiate a trig function which I did, and find the gradient given a point. However my answer is not what the book's answer is - can someone help me spot what I did wrong?

(Question, my answer and actual answer on image)

image.jpeg


Put your calculator into Radians mode.
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Yusufff
OP
10
:facepalm: D'oh! Thank you - I thought it was already in Radians mode.

Original post by NotNotBatman
Put your calculator into Radians mode.

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