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2 x sin 45 x cos 60=
2 . 1/2√2 . 1/2 = 1/2√2
B.
a = 45 b = 60
sin 45 x cos 60 + sin 60 x cos 45 =
1/2√2 . 1/2 + 1/2√3 . 1/2√2=
1/4√2 + 1/4√6 =
1/4(√2+√6)