At 2:35 how can you take sqrt of cos^2θ to to be cosθ? There are no bounds on θ to justify this. It can be +cosθ or -cosθ.
@JatheenVarmaBuddharaju
2 күн бұрын
Hmmm .. never thought about that perspective. I have same question :) What should we do with sqrt(t^2) take it as t or - t ? Generally we take it as positive only right..?
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