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Thread: Please help with the following differentiation

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    Please help with the following differentiation

    Differentiate:

    A) y = tan^3 (5x-4)
    B) y= 1/5 sin^5x -1/7sin^7 x
    C) y = ln ((1+sin x)/(cos x))
    D) y= cot x

    Thanks in advance

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    Re: Please help with the following differentiation

    When differentiating trigonometric functions it's less confusing to write them out fully.

    e.g. rewrite as .

    It's easy to see that you can just differentiate this with the chain rule. There are three nested functions in that particular example so you will need to use the chain rule with three functions.

    For D), you can either rewrite the function as or and proceed from there.

    This site (https://www.derivative-calculator.net/) is very helpful for full solutions.
    HSC 2018 - [English Adv.] • [Maths Ext. 1] • [Maths Ext. 2] • [Chemistry] • [Software Design and Development]

    1(3√3) t2 dt cos(3π/9) = log(3√e) | Integral t2 dt, From 1 to the cube root of 3. Times the cosine, of three pi over nine, Equals log of the cube root of e.

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    Re: Please help with the following differentiation

    so basically think about it like this

    sin^2(x) is same as (sin(x))^2

    Use chain rule here for d/dx
    d/dx(sin^2(x)) = 2(sinx)^1(cosx)
    = 2sinxcosx

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    Re: Please help with the following differentiation

    btw if possible can you bracket your answer better, ill solve them for you if you want further help,

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    Re: Please help with the following differentiation

    You should use more brackets to make things clearer but for these questions remember how sec, cosec and cot are the reciprocals of sin, cos and tan respectively and you treat them as powers of -1. As for everything else remember your basic and trigonometric differentiation techniques. As for ln, you follow f'(x)/f(x) and simplify accordingly with your other identities such as tan=sin/cos and the reciprocals.

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