MelodieLaborn544 MelodieLaborn544

04-09-2014
Mathematics

contestada

Derive identity sin(3x) = 3 sinx−4 sin³x

Respuesta :

Аноним Аноним

04-09-2014

[tex]sin3x=3sinx-4sin^3x\\\\L=sin(2x+x)=sin2xcosx+sinxcos2x\\\\=2sinxcosxcosx+sinx(cos^2x-sin^2x)\\\\=2sinxcos^2x+sinxcos^2x-sin^3x\\\\=3sinxcos^2x-sin^3x\\\\=3sinx(1-sin^2x)-sin^3x\\\\=3sinx-3sin^3x-sin^3x\\\\=3sinx-4sin^3x=R[/tex]

Answer Link

Otras preguntas

explain how US involvement in the Spanish American war represented a shift from isolationism to intervention

Select the correctly written sentence. If no sentence is correct, select "none of the above." Question 1 options: After calling her mom, cooking dinner, and fin

1. Solve -2n + 5 > 7. 2. Kia experimental probability of striking out at baseball is 13%. Out of 30 times at bat about how many times will she strike out?

Which one would be the correct

What is the range of this function?

Which delegate to the constitutional convention was worried that the new government that he helped to create might be too democratic?

What is the name of this molecule? CH2 - CH2 - CH3 | CH3 - CH2 - CH - CH2 - CH = CH3

what is the best definition of plot? A: who is in the story B: What is happening in the story C: where the story takes place D: WHEN the story takes place

HELP If f(x)=1/7x-9,then f^-1(x)=?

I really suck at math. please help =)