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Learn more about the law of sine and cosine on Brilliant: brilliant.org/blackpenredpen/ (now with a 30-day free trial)
I came up with this tricky test question challenge for my precalculus students. Start with an obtuse triangle, give students the length of all three sides and one of the acute angles. Ask the students to find the measure of the obtuse angle. Now many students will proceed by using the Law of Sine because the formula is shorter compared to the Law of Cosine. But because the range of the inverse sine function is _________, we will have to be extra careful with we use the Law of Sine!
Written solutions for this problem: / 81996867
My trig worksheets (for anyone): / 81996734
Here's another precalculus challenge: • Precalculus challenge:...
Proofs of the Law of Sine & Cosine: • Classic math proofs of...
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Thank you all!
0:00 my favorite precalculus test question
5:02 a small mistake. c should be 5.8
8:24 Check out Brilliant