SOLUTION: Find sin2b if sin b = 7/25

Question 993791: Find sin2b if sin b = 7/25
Answer by ikleyn(52798) (Show Source): You can put this solution on YOUR website!
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Find sin2b if sin b = 7/25
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Is my understanding correct that you want to find sin(2b)?

If so, use the formula sin(2b) = 2*sin(b)*cos(b).

Do you know this formula?

To complete calculations, you need to know cos(b) too.
You can calculate it via sin(b):

cos(b) = = = = = = .

Now you are ready to calculate

sin(2b) = 2*sin(b)*cos(b) = .. = . . .

Please complete this calculation yourself.

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