Asked by JESS

1)how do you simplify 3xcos5x using trigometric functions
2)how do you simplify sin2xcos4x using trigometric functions

Answers

Answered by Steve
don't know what you mean by "simplify". They're already pretty simple.

I see no way to rewrite 3x cos5x

sin2x cos4x = (sin6x + sin2x)/2
but that doesn't look any simpler to me.

any further clarification?
Answered by JESS
how did you do sin2x cos4x = (sin6x + sin2x)/2 what os the formula I need to use
Answered by JESS
Steve help please
Answered by Steve
use the trig sum-to-difference formulas

sinAcosB = (sin(A+B) + sin(A-B))/2

You must have seen such. If not a visit to

http://oakroadsystems.com/twt/sumdiff.htm

bears study
Answered by JESS
cos3xcos5x
how do rewrie this using trigmetric finctions Steve thanks
Answered by Steve
come on - give it a try using the formulas. What do you come up with?
Answered by JESS
(cos8x+cos2x)/2 steve is it right
Answered by JESS
steve
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