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# Trig Question watch

1. My workings:

I believe my method is correct but my answers for part (a) do not match with the answers given. Also, can someone explain to me how part (b) is done? I tried differentiation, but I only ended up with a minimum. Moreover, I don't think differentiation is the right approach here since they haven't specified the range and want us to find the global maximum & minimum. How is this to be done?

Thanks!

Sid

EDIT: it should be x = +-theta +2n(pi). That doesn't matter really but I thought I'd mention it anyway.
Attached Images

2. for part b) there is no need for calculus...

to make the fraction big you use the smallest value of f(x)... and add 6

to make the fraction small you use the biggest value of f(x)... and add 6

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Updated: December 27, 2014
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