A-Level Maths: E1-02 [Trigonometry: Two Triangles to Learn]

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there was this question on ocr mei 2018 mechanics and pure paper and a trig graph question where you find points of intersection of 4cos x = 2sin x and the markscheme showed us a triangle i've never even seen before where it had root 5, 2 and 1. what is that triangle? The markschemes rubbish as it doesn't even tell you every step needed to find the answer

_GShock_
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Can't you just use your calculator?

avacyn