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Mathematics
Problem
Evaluate
sin
75
∘
cos
15
∘
−
cos
75
∘
sin
15
∘
\sin 75^{\circ}\cos 15^{\circ}-\cos 75^{\circ}\sin 15^{\circ}
sin
7
5
∘
cos
1
5
∘
−
cos
7
5
∘
sin
1
5
∘
. a)
1
1
1
b)
3
2
\dfrac{\sqrt3}{2}
2
3
c)
1
2
\dfrac12
2
1
d)
6
+
2
4
\dfrac{\sqrt6+\sqrt2}{4}
4
6
+
2
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