A-LevelMathematicsTrigonometry9709/12 · Oct/Nov 2013 · Q13 Marks
Given that cosx = p, where x is an acute angle in degrees, find, in terms of p,
- (i)sinx,[1]
- (ii)tan x,[1]
- (iii)tan(90° – x).[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2013). The mark or mark type is shown in brackets.
- [1] sinx = √(1 - p²)
- [1] for answer to (i) used. tan x = √(1-p²) / p
- [1] for reciprocal of (ii) tan(90° – x) = p / √(1-p²)
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