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jkl3inberg
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Use a sum or difference formula to find the exact value of the following:
sin(5π/7)cos(π/21)cos(5π/7)sin(π/21)
 one year ago
 one year ago
jkl3inberg Group Title
Use a sum or difference formula to find the exact value of the following: sin(5π/7)cos(π/21)cos(5π/7)sin(π/21)
 one year ago
 one year ago

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cwrw238 Group TitleBest ResponseYou've already chosen the best response.2
use the identity sin (a  b) = sin a cos b  cos a sin b
 one year ago

jdoe0001 Group TitleBest ResponseYou've already chosen the best response.0
http://www.mathplanet.com/images/math/codecogs_ca939b37.gif
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.2
so your expression becomes sin (5pi/7 + pi/21)
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.2
= sin 16pi/21
 one year ago
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