CBSE Guess > Papers > Question Papers > Class X > 2009 > Mathematics > Mathematics
Q. 20. For an acute angle show that
(sin – cosec ) (cos – sec ) =
Sol. LHS = (sin – cosec) (cos – sec ) = = = =
RHS=
=
=…..[ cos2 +sin2 = 1]
= cos + sin …(ii)
From (i) and (ii) LHS = RHS