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Given: a and B are firstquadrant angles, sin a=5/13, and cosB= 3/5. evaluate sin(aB).
a.) 33/65
b.) 33/65
c.) 63/65
 one year ago
 one year ago
Given: a and B are firstquadrant angles, sin a=5/13, and cosB= 3/5. evaluate sin(aB). a.) 33/65 b.) 33/65 c.) 63/65
 one year ago
 one year ago

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ash2326Best ResponseYou've already chosen the best response.2
Use this here \[\sin (AB)=\sin A\times \cos B\sin B\times \cos A\]
 one year ago

ash2326Best ResponseYou've already chosen the best response.2
sin a=5/13, and cosB= 3/5
 one year ago

aussy123Best ResponseYou've already chosen the best response.0
I tried this but the book is asking me to subtitute pi/2 for a
 one year ago

aussy123Best ResponseYou've already chosen the best response.0
and I know I have to solve for sin B and cos A
 one year ago

ash2326Best ResponseYou've already chosen the best response.2
\[\sin (B)=\cos (\frac {\pi}{2} B)\] \[\cos A=\sin (\frac{\pi}{2}{A})\] you can use \[\sin^2 x+\cos^2 x=1\] to figure out sin B and cos A
 one year ago
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