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C3 Question

Guys please check the link provided and fast forward to like 6:20 ish and explain why he said maximum occurs at -1.. Shouldnt maximum be 1 and minimum -1?? Please help exam in 2 days http://examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=95&solution=4.1
Original post by MrBiology
Guys please check the link provided and fast forward to like 6:20 ish and explain why he said maximum occurs at -1.. Shouldnt maximum be 1 and minimum -1?? Please help exam in 2 days http://examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=95&solution=4.1

By the way, it's much easier for us to help if you transcribe the problem :smile:

A maximum of cos occurs at 0, when cos=1. Cos is minimised at pi/2, when it takes the value -1. However, maxima/minima of cos correspond respectively to minima/maxima of p, because p is an expression with cos on the denominator.

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