exam Maths Puzzle Numerical Ability

3/ratical of 7+5

please help me rationalize the denominator!

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I need help please.

The function that relates weight in grams of a crystal (w) to the temperature t in degrees Fahrenheit in which it was grown is as follows (fictitious):
W(t) = 0.8t + 12

Find w(-6). Add or subtract the fractions then simplify using the Pythagorean identities and factoring to find the expression that completes the identity.

sinx/(cosx+1) + (cosx+1)/sin x

Please show me the steps. Thank you!