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Question
Mathematics
The value of Cos (270° +θ )Cos (90° - θ ) - Sin (270° - θ )Cos θ is
Q. The value of
C
os
(
27
0
∘
+
θ
)
C
os
(
9
0
∘
−
θ
)
−
S
in
(
27
0
∘
−
θ
)
C
os
θ
is
1668
202
KCET
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A
0
27%
B
−
1
27%
C
2
1
27%
D
1
18%
Solution:
cos
(
27
0
∘
+
θ
)
cos
(
9
0
∘
−
θ
)
−
sin
(
27
0
∘
−
θ
)
cos
θ
=
sin
θ
⋅
sin
θ
+
cos
θ
⋅
cos
θ
=
sin
2
θ
+
cos
2
θ
=
1