Asked by elise
Use the product-to-sum formula to write the given product as a sum or difference.
6sin π/10 cos π/ 10
6sin π/10 cos π/ 10
Answers
Answered by
Steve
look up your formulas. You want
2 sin(a) cos(b) = sin(a+b) cos(a-b)
You don't even need the product-to-sum formulas, since your double-angle formula says that
cos(2x) = 2 sinx cosx
2 sin(a) cos(b) = sin(a+b) cos(a-b)
You don't even need the product-to-sum formulas, since your double-angle formula says that
cos(2x) = 2 sinx cosx
Answered by
Steve
Dang! That is
sin(2x) = 2 sinx cosx
sin(2x) = 2 sinx cosx
Answered by
elise
that isn't one of my answers?
Answered by
Steve
you telling me or asking me?
Naturally, sin(2x) is not one of your answers, but if you let x = π/10 and you plug that in, I bet it is one of your answers.
Naturally, sin(2x) is not one of your answers, but if you let x = π/10 and you plug that in, I bet it is one of your answers.
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