In ∆ABC, ∠A = 90°. If AB = 7 cm and BC - AC = 1 cm, find :
(i) sin C
(ii) tan B
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In △PQR, ∠Q = 90°. If PQ = 40 cm and PR + QR = 50 cm, find :
(i) sin P
(ii) cos P
(iii) tan R
In △ABC, AB = AC = 15 cm, BC = 18 cm. Find
(i) cos ∠ABC
(ii) sin ∠ACB.