Q4. a) Use the angle addition formulae for sine and cosine to prove that tan A+tan B tan(A+B) = 1-tan Atan B b) Let AABC

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Q4 A Use The Angle Addition Formulae For Sine And Cosine To Prove That Tan A Tan B Tan A B 1 Tan Atan B B Let Aabc 1 (18.28 KiB) Viewed 54 times

Q4. a) Use the angle addition formulae for sine and cosine to prove that tan A+tan B tan(A+B) = 1-tan Atan B b) Let AABC be a triangle that is not a right-angle triangle. Use the result from part a to show that the angles A, B, and have the following property tan A+tan B+tan C = (tan A)(tan B)(tanC). c) Why do we have to exclude the right-angle triangle in part b? (One line answer) -