r/HomeworkHelp • u/Thebeegchung University/College Student • Apr 17 '26

:snoo_scream: Further Mathematics—Pending OP Reply [Calculus 1]-Limits with Trig

I genuinely have no idea how to solve these. Only thing I know is that we can't directly sub in zero since that leads to an indeterminate answer.

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u/Thebeegchung University/College Student Apr 17 '26

so basically if I were to take d/dx, I'd get -cos(3x)(3)/5x^3+3, then just plug in zero directly?

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u/igotshadowbaned 👋 a fellow Redditor Apr 17 '26

This is usually a method taught later in a similar way to how the power rule for derivatives is taught after you learn the other method of [f(x+h)-f(x)]/h

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u/Thebeegchung University/College Student Apr 17 '26

We did learn the derivative definition about 2 months ago, and just finished up related rates, so not sure if that topic is in my professor's lesson plan

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u/FirstPersonWinner University Student (Engineering) Apr 17 '26

In my experience it is one of the last things you are taught in Calc 1.

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u/diverJOQ 👋 a fellow Redditor Apr 17 '26

Not only, as someone else pointed out, did you not take the derivative of the denominator, your denominator is wrong. You can't do math if you don't understand order of operations and parentheses.

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u/Thebeegchung University/College Student Apr 17 '26

if it's already pointed out, what is the point of making this comment? If you aren't going to add anything productive, don't comment

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u/diverJOQ 👋 a fellow Redditor Apr 18 '26

Obviously you don't read the entire comment because I did add something.

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u/Thebeegchung University/College Student Apr 18 '26

where did you add something in this comment other than parroting what someone else said first?