exam Maths Puzzle Numerical Ability

Prove that this equation is an identity:
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(sinx + cscx)� + (cosx + secx)� �</font> tan�x + cot�x + 7</PRE>

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exam Other Question

18. Determine which two equations represent perpendicular lines.
(a) y = x - 3
(b) y = 5x -
(c) y = x +
(d) y = x

A) (a) and (b)
B) (b) and (c)
C) (a) and (d Draw the coordinate axes relative u and v and locate w if u=[-2, 3], v=[2,1]