Q3 of 123 Page 9

If then write the value of

Given then the value of








Hence



But as given,


This states that, 90° < x < 270°, which means x lies between 2nd and 3rd quadrants.


In the 2nd and 3rd quadrants, the cosine function is negative, so the value of



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If then write the value of k.

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If then write the value of m sin x + n cos x.

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If then write the value of in the simplest form.

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If then write the value of