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Mathematics
Mathematics
Problem
The expression
sin
45
∘
cos
30
∘
−
cos
45
∘
sin
30
∘
\sin45^{\circ}\cos30^{\circ}-\cos45^{\circ}\sin30^{\circ}
sin
4
5
∘
cos
3
0
∘
−
cos
4
5
∘
sin
3
0
∘
is equal to a)
cos
15
∘
\cos15^{\circ}
cos
1
5
∘
b)
sin
15
∘
\sin15^{\circ}
sin
1
5
∘
c)
sin
75
∘
\sin75^{\circ}
sin
7
5
∘
d)
sin
30
∘
\sin30^{\circ}
sin
3
0
∘
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