Using addition formulas for sine and cosine to simplify the expression:
cos (2pi/9) cos...
Mathematics, 12.01.2020 16:31 christinavelez26
Using addition formulas for sine and cosine to simplify the expression:
cos (2pi/9) cos (pi/18) sin (2pi/9) sin(pi/18)
i want to learn it the normal way first before i add my instructors instructions to place s=45 & t = 30.
here are the formulas given:
sin(s t) = sin s cos t cos s sine t
sin(s-t) = sin s cos t - cos s sine t
cos(s t) = cos s cos t - sin s sin t
cos(s-t) = cos s cos t sin s sin t
the they way it looks, it seems to use formula 4:
cos(s-t) = cos s cos t sin s sin t
Answers: 2
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