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April 18, 2015

April 18, 2015

Posted by **Shannon** on Saturday, May 11, 2013 at 8:43pm.

(1) sin 22° (2)sin 81° (3) cos 22° (4) cos 81°

- Math -
**Reiny**, Sunday, May 12, 2013 at 12:23amrecall that

sin(A+B) = sinAcosB + cosAsinB

we have the pattern of the right side of that equation

sin 25° cos 47° + cos 25° sin 47°

= sin(25+47) =**sin 72° or cos 18°**by the complimentary angle property

which does not match any of your choices, so

"none of these"

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