OpenStudy (anonymous):

Would appreciate help thank you. Simplify the following expression sin5x cos2x + sin2X cos5X= ?

OpenStudy (anonymous):

= 2 sin2X cos5X

OpenStudy (anonymous):

using cos A cos B - sin A sin B = cos (A+B) we get puting A = 5x, B = 2x above is cos 7x

OpenStudy (anonymous):

Are you sure because it doesnt ask for values of such but rather the end form

OpenStudy (anonymous):

yes i am sure

OpenStudy (anonymous):

which math are u in precalculas

OpenStudy (anonymous):

or calculas

OpenStudy (anonymous):

Yeah precalc, how did you know?

OpenStudy (anonymous):

because we studied this

OpenStudy (anonymous):

in 9th grade

OpenStudy (anonymous):

that helps u to do it

OpenStudy (anonymous):

Oh i see, so the answer would be A = 5x, B = 2x cos=7x?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

u r correct