Q20 of 118 Page 5

If show that

Given tanx = a/b

LHS

Dividing by b cosx,

Substituting value of tanx,

= RHS

Hence proved.

If find the values of tanx, secx and cosecx

If then find the value of

If cosecx – sinx = a³, secx – cosx = b³, then prove that a² b² (a² + b²) = 1.

If cotx(1 + sinx) = 4m and cotx(1 – sinx) = 4n, prove that (m² – n²)² = mn.