निम्नलिखित को सिद्ध कीजिए:
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1
Answer:
Step-by-step explanation:
सिद्ध करना है :-
L.H.S.
=
माना तथा
∴ = cosA . cosB - sinA .sinB
= cos (A+B) [ ∵ cos (A+B) =cosA . cosB - sinA .sinB]
A तथा B का मान रखने पर
=
=
=
= sin(x+y) [ ∵ cos(π/2 - θ) = sinθ]
= R.H.S.
अतः L.H.S. = R.H.S.
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