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I did not understand the part which is in a box.... How did that happen?

I did not understand the part which is in a box.... How did that happen?

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Grade:11

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
5 years ago
Dear student

Please post the complete image for broader context
Aditya Gupta
2081 Points
5 years ago
no there is noo need to post a new image. the above image is too clear.
B and C lie in 0 to 3pi/4, so by usual rules of inequalities, B-C is bound to lie in -3pi/4 to 3pi/4.
now cos(B-C) will attain its max value 1 at B-C=0.
and it will attain its least value -1/root2 at B-C= +-3pi/4 [this is clear from graph of cosine]
hence it lies in between -1/root2 to 1

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