Exercise #15 notes

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Exercise #15 notes

  1. 1. Exercise #15Trigonometric Identities IIWhen LHS = RHS, the identity has been proved. Some common operations whenproving identities are: 1. Adding/Subtracting rational expressions 1 1 Ex.  2 cos  sin  2 2. Multiplying/Dividing rational expressions  1  1  Ex.   2   cos   sin   2 3. Factoring Ex. sin   sin  cos  3 2 4. Multiplying by the conjugate 1 Ex. 1  sin 
  2. 2. ExamplesProve each of the following: tan   cot  1.  2sin 2   1 tan   cot  2. cos   tan  sin   sec
  3. 3. 3. sin  cos sec csc  1 1  tan 2 4.  csc2  tan  2

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