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Simplify the expression $\frac{d^2}{dx^2}\left(\sin\left(4x\right)\right)\cos\left(y\right)$

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Algebra 2 - Dividing two rational expressions (x^2/x^2 - y^2) / (4x/y-x)

https://www.youtube.com/watch?v=5MNXHwO_COA

Pre-Calculus - How to simplify a trig expression using co-function, sin((pi/2) -x)/cos((pi/2) -x)

https://www.youtube.com/watch?v=LxdYYK2mnx4

Pre-Calculus - How to simplify a trigonometric expression by squaring a binomial (sin(x)+cos(x))^2

https://www.youtube.com/watch?v=e5IczuZxvVI

Algebra 2 - Learning to multiply two radicals together and then simplify, sqrt(12x^2 y).sqrt(3xy^4)

https://www.youtube.com/watch?v=SJz8DaUvJoM

Algebra 2 - Learn how to rationalize the denominator to simplify an expression, sqrt(y)/sqrt(5)

https://www.youtube.com/watch?v=G1Z66nMlBF0

Algebra 1 - Distributive Property, 4x(2x+y); -3(3a^2 -a+7); 2xy(x^2 -3xy+4x); (x/6)(x^2 +5x-9)

https://www.youtube.com/watch?v=4xx87GKdm04

Main Topic: Simplification of algebraic expressions

The simplification of algebraic expressions consists in rewriting a long and complex expression in an equivalent, but much simpler expression. This simplification can be accomplished through the combined use of arithmetic and algebra rules.

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