Express the sum or difference as a product. sin 4x - sin 6x

A. 2 cos 4x cos 5x

B. 2 sin 5x cos x

C. -2 sin x cos 5x

D. -2 sin x
I picked C

Question

Express the sum or difference as a product. sin 4x - sin 6x

A. 2 cos 4x cos 5x

B. 2 sin 5x cos x

C. -2 sin x cos 5x

D. -2 sin x
I picked C

anonymous · Answer

do you recall the trigonometric identities?

anonymous · Answer

specifically the sum-to-product formulas

anonymous · Answer

no

anonymous · Answer

i believe you used the wrong formula, there shouldnt be a negative sign on the front.

jdoe0001 · Answer

so, what's the sum-to-product identity @Girl_Ninja ? since you do know it

jdoe0001 · Answer

hehe

jdoe0001 · Answer

are you asking for help on solving or just a "letter" to pick from?

anonymous · Answer

both

jdoe0001 · Answer

I mean, if you need with the formula and the angles, or a Unit Circle, I have those :), now if  you're just asking for a "letter" off whatever choices, then well, I'm not so sure that helps you

anonymous · Answer

do you have the sum to product formula sheet your teacher gave you

anonymous · Answer

all you have to do is select the right formula and plug in the numbers for the formula to find the answer.

anonymous · Answer

http://www.sosmath.com/trig/prodform/prodform.html

anonymous · Answer

i have this http://etc.usf.edu/clipart/43200/43215/unit-circle7_43215.htm

anonymous · Answer

http://www.sosmath.com/trig/prodform/img6.gif

anonymous · Answer

use this formula

anonymous · Answer

show me the work for your answer(s)

anonymous · Answer

I was right from the beginning its C

jdoe0001 · Answer

http://www.mathwarehouse.com/trigonometry/identities/images/angle-sum-formula-picture.gif see there? just replace the (+), for a (-), and that'll give you the answer :)

jdoe0001 · Answer

lol

jdoe0001 · Answer

maybe it was "z" :), who knows

anonymous · Answer

lol whatever