TRIGONOMETRY - PART - 42 - TRIGONOMETRICAL RATIOS - 100 PROBLEMS

ICSE MATHS CLASS 9 – PAGE -294

EXERCISE – 22(B) – PROBLEM – 33

In triangle ABC angle C = 90 degrees, AB = 20 and BC = 12, D is a point in side AC such that CD = 9. Taking angle BDC = x find

(i) sin angle ABC and (ii) tan x – cos x + 3 sin x.