I keep getting “Range of sine and cosine” questions wrong in Trigonometry. What's the trap?
accepting an answer where sinθ > 1.
The usual trap: accepting an answer where sinθ > 1. How to avoid it: if a step gives sinθ = 1.4, you've made an error somewhere. Go back to the definition — sinθ and cosθ always lie between −1 and 1.
Key point
Range of sine and cosine
Common mistake
accepting an answer where sinθ > 1.
Memory tip
if a step gives sinθ = 1.4, you've made an error somewhere.
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