s in 3 0 o − s in 4 5 o cos 4 5 o s in 3 0 o = 2 1 s in 4 5 o = cos 4 5 o = 2 2 s in 3 0 o − s in 4 5 o cos 4 5 o = 2 1 − 2 2 ⋅ 2 2 = 2 1 − 4 2 = 2 1 − 2 1 = 0 A n s w er : a .
sin30 1/2 sin45*cos45=1/2 => 1/2 - 1/2 = 0
The exact value of sin 3 0 ∘ − sin 4 5 ∘ cos 4 5 ∘ is 0. Thus, the correct answer is option A.
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