identity cos(x-y)

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`x`²	`x`^□	log_□	√☐	^□√☐	≤	≥	□□	·	÷	`x`^◦	π
(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

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∫ xcos(x)dx

Solution

xsin(x)+cos(x)+C

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∫ xcos(x)dx

Apply Integration By Parts: xsin(x)−∫ sin(x)dx

=xsin(x)−∫ sin(x)dx

∫ sin(x)dx=−cos(x)

=xsin(x)−(−cos(x))

Simplify

=xsin(x)+cos(x)

Add a constant to the solution

=xsin(x)+cos(x)+C

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−▭▭	<	7	8	9	÷	`AC`
+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

identity cos(x-y)

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