Minimum number of directors required in a public company

tan 4˚ × tan 43˚ × tan 47˚ × tan 86˚ = ?

If cos4B = sin(B - 10°), then find the measure of 'B'.

∆ PQR is right-angled at Q. If ∠R = 60º, then find the value of cosec P.

If sec(2A + B) = 2 and cos(A + B) = (1/√2) , find the value of {sec 2B + tan (A + B) } given that 0^o < A, B < 90^o

What is the simplified value of the given expression?

3(sin² 50° + sin² 40°) + 6sin 30° - (3sec 60° + cot 45°)

Find the value of sin 240 ^°

If cos(90° − θ) = 3/5 for an acute angle θ, find: