- Sin(x-y)/sin y + cos (x-y)/cos y = sinx/(sinycosy) Verify identity in detail?

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How to change Lead(II)nitrate into a chemical fourmula? Find the equation of the tangent at a:x^(4)+y^(3)+2x-2y-2=0 at the point (-1;3)
really tough problem? Asfalft, can i add rock to it? The answers to scientific inquiry questions are in the form of what? How do u work out the value of 0.1 + 0.3 + 0.3 x 0.4?