Christmas MT's answer to Blehhhh's Secondary 3 E Maths question.

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Christmas MT
Christmas Mt's answer
2904 answers (A Helpful Person)
1st
The basic form of sin x, cos x and tan x involve right angled triangles. There is one formula involving right angled triangles you learnt in... Sec 1(?): Pyhthygoras Theorem.

Form the right angled triangle, and from there you can get cos x and tan x.

Just to let you check your answer after you figure it out, (a) = 5/13, and (b) = 173/39