Page 5 - LN
P. 5
Graph ofsine and cosine can be discussed, so that students know that
−1 <sin θ< +1 and −1 <cosθ< +1 for any value of θ .
Example 1:Evaluate .
Solution:
( by rationalising the denominator)
5 3−2 5 2 − 3
= =
6 (−1) 6
Example 2:If . Then, find the value of .
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