Hello everyone,

I got two problems that I need help with:

Find dy/dx

1- cos 3y = tan 2x

2- x cos y = sin(x+y)

Thank you so much!

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- Apr 7th 2010, 12:56 AMImaginaryImplicit Defferentiation
Hello everyone,

I got two problems that I need help with:

Find dy/dx

1- cos 3y = tan 2x

2- x cos y = sin(x+y)

Thank you so much! - Apr 7th 2010, 02:54 AMCaptainBlack
- Apr 7th 2010, 02:59 AMAir
Differentiate both sides with respect to $\displaystyle x$ and then rearrange to make $\displaystyle \frac{\mathrm{d}y}{\mathrm{d}x}$ the subject.

1.

Alongside implicit differentiation, use chain rule when differentiating both sides.

2.

Alongside implicit differentiation, use product rule when differentiating LHS. For RHS, alongside implicit differentiation, use product rule and chain rule when differentiating.