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Precalculus and/or calculus.
We don't have the questions. We don't keep them around, because the policy of this website is that we don't give out the answers to homework or practice exercises. Most of us consider that to be cheating.
there can be more than 1 answer for some trig equations and you must use your knowledge of periodicity to get the answers.
To become a chemist you need a wide range of talents, but the main types of math that they use are probobly Algebra, trig, and Calculus.
The law of sines: http://www.ies.co.jp/math/java/trig/seigen/seigen.html