1.

Prove the following : cos(A+B)+sin(A-B) 2sin(45^@+A)cos(45^@+B)

Answer»

SOLUTION :R.H.S. = 2sin(`45^@`+A)cos(`45^@`+B)
sin(`45^@+A-45^@-B`)
sin(`90^@+A+B)sin(A-B)
= cos(A+B)sin(A-B) = L.H.S.


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