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Byju's Answer
Standard X
Chemistry
Based on the Type of Solvent
Prove that - ...
Question
Prove that - cos20 cos100 + cos100 cos140 - cos140 cos200 =-3/4
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Similar questions
Q.
Evaluate:
cos
20
∘
cos
100
∘
+
cos
100
∘
cos
140
∘
−
cos
140
∘
cos
200
∘
Q.
cos
20
∘
cos
100
∘
+
cos
100
∘
cos
140
∘
−
cos
140
∘
.
cos
200
∘
is equal to
Q.
The value of the expression
cos
20
∘
cos
100
∘
+
cos
100
∘
cos
140
∘
−
cos
140
∘
cos
200
∘
is
Q.
Match the column
List I
List II
A.
cos
20
∘
+
cos
80
∘
−
√
3
cos
50
∘
1.
−
1
B.
cos
0
∘
+
cos
π
7
+
cos
2
π
7
+
cos
3
π
7
+
cos
4
π
7
+
cos
5
π
7
+
cos
6
π
7
2.
−
3
4
C.
cos
20
∘
+
cos
40
∘
+
cos
60
∘
+
4
cos
10
∘
cos
20
∘
cos
30
∘
3.
1
D.
cos
20
∘
cos
100
∘
+
cos
100
∘
cos
140
∘
−
cos
140
∘
cos
200
∘
4.
0
Q.
Evaluate
cos
20
∘
+
cos
100
∘
+
cos
140
∘
.
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