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=)
Answer this Question
More Related Questions
- Math - Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y...
- Trigo help! - Ok, i've tried this question, and it brings me to no answers. ...
- Trigonometry - Prove that (cosy/1+siny) + (1+siny/cosy) = 2secy
- Math help again - cos(3π/4+x) + sin (3π/4 -x) = 0 = cos(3π/4)cosx...
- calc - what is the derivative of sinx- cosy = 0 in its simplest form? I got to ...
- Trig (inverse functions) - Problem: tan[arccsc(-5/3) + arctan(1/4)] My work: let...
- trig - Okay, I've been getting some of these, but I can't seem to verify this ...
- Math - How do I get (sinx cosy + cosx siny) (cosx cosy + sinx siny) in the form ...
- maths (trigonometry) - please solve these if possible Q1. If sinx +siny=3(cosy-...
- precalculus - 1.csc^2x-1/csc^2x=cos^2x 2.1/1-cosx+1/1+cosx=2csc^2x 3.sinxcosy+...