Use the definition of derivative to find d/dx cos(x).
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Originally Posted by kwivo Use the definition of derivative to find d/dx cos(x). by the limit definition of the derivative: thus, now, continue (begin by using the addition formula for cosine to expand in the numerator
You can use the addtion formula for cos. = = Can you finish?.
Ok, I'm not sure how to get rid of the cos(h)-1/h, but the sin(h)/h is equal to 1 right?
Originally Posted by kwivo Ok, I'm not sure how to get rid of the cos(h)-1/h, but the sin(h)/h is equal to 1 right? happens to be a special limit. look it up. ... nevermind, it's equal to zero. yes,
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