Posted by Anonymous on Tuesday, February 21, 2012 at 3:31pm.
What do I do next???
Please Help and Thank You
Trigonometry Help - Reiny, Tuesday, February 21, 2012 at 5:08pm
expand it again
= sinx cos^2 y - cosxsinycosy + cosxcosysiny + sinxsin^2 y
= sinx(cos^2 y - sin^2 y)
Trigonometry Help - Anonymous, Tuesday, February 21, 2012 at 5:19pm
when I substitue the x's and y's I get different answers.
do I need brackets on (sinxcosy-cosxsiny) and (cosxcosy+sinxsiny)?
could the next step be: sinxcosy-cosxsinycosy+cosxcosy+sinxsinysiny without the brackets? or would that be wrong?
correction - Trigonometry Help - Reiny, Tuesday, February 21, 2012 at 6:01pm
found my error
2nd last line should have been
= sinx(cos^2 y + sin^2 y)
= sinx (1)
Trigonometry Help - Anonymous, Tuesday, February 21, 2012 at 6:12pm
thank you so much=)
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