Question

Question number (iv). Evaluate

Answer 1

Answer: 5/2

Step-by-step explanation:

Sin 47/Cos 43 = Sin 47/ Cos (90 - 47) = Sin 47 / Sin 47 = 1......(i)

Cos 43/ Sin 47 = Cos  43/ Sin ( 90-43) = Cos 47/ Cos 47 = 1............(ii)

From (i) and (ii) we get,

1² + 1² - 3Sin30

= 1 + 1 - 3*1/2 = 2 + 1/2 = 5/2 = Answer

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Answer 2

refer the attachment...