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Mathematics
Mathematics
Problem
Find the value of
cos
(
270
∘
+
θ
)
cos
(
90
∘
−
θ
)
−
sin
(
270
∘
−
θ
)
cos
θ
\cos(270^\circ + \theta)\cos(90^\circ - \theta) - \sin(270^\circ - \theta)\cos \theta
cos
(
27
0
∘
+
θ
)
cos
(
9
0
∘
−
θ
)
−
sin
(
27
0
∘
−
θ
)
cos
θ
.
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