In , right-angled at Q, PQ = 3 cm and PR = 6 cm. Determine .

Find acute angles A and B, if sin (A + 2B) = and cos (A + 4B) = 0, A > B.

If A and B ae acute angles such that tan A = , tan B = and tan (A + B) = , find A + B.

Evaluate the following:

(i) (ii)

(iii) (iv)

(v)

Evaluate the following:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii) cosec 31° - sec 59°

(viii)

(ix)

(x)

(xi)