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
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CBSE 2009 Question Papers Class X