Answer :
formula: – (i)
(ii)
(iii) a2 + b2 + 2ab = (a + b)2
(iv) a2 – b2 = (a – b)(a + b)
(v)
multiplying with, we get
using formula (i) and (ii)
using formula(iii) &(iv)
Dividing with
using formula(v)
[we know that tan 45
therefore L.H.S = R.H.S
Hence, Proved.
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