Math, asked by Raen, 1 year ago

Explain, why cosA= √(1-sin^2A) is the only value we have taken. Why not the negative one?

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Answered by brunoconti

Answer:

Step-by-step explanation:

well this can happen Only if the angle A is acute. But it is not mentioned that A is acute in the picture you sent. So it has to be mentioned before on the same page or in the page before. check it out.

Raen: Actually, they haven't taught us unit circle trigonometry at ALL. The approach has been with only acute angles in general. Thus, it actually hasn't been mentioned they are acute. My major worry is... If this question is asked formally in some examination ( based on this book), then what should I write? Should I mention the third quadrant?

brunoconti: yes you should if you want to be totally right and i Think they should appreciate you doing this.....Good puck

brunoconti: luck

Raen: Thanks! :)

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