Solution To Moderate Exercise Number Two

MODERATE EXERCISES

(2)  Evaluate and simplify.

 (a) 2cos 45^o + cos 180^o

 (b)         1
     -----------------
     sin 30^o + cos 60^o

SOLUTION:


 (a) 2cos 45^o + cos 180^o = 2(/2) + -1
                        =  - 1

 (b)         1                1
     ----------------- = ---------- = 1/1 = 1
     sin 30^o + cos 60^o    1/2 + 1/2

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