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

Mathematics 2009 Question Papers Class X
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