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Maths CBSE Mentoring Hindi
Class 10 Crash course
Introduction to trigonometry
Annual Revision IV - Introduction to Trigonometry
6.
Prove the given trigonometric equation
Question:
3
m.
Answer variants:
sin
A
1
+
2
sin
2
A
cos
A
2
cos
2
A
+
1
sin
A
1
−
2
sin
2
A
cos
A
2
cos
2
A
−
1
sin
A
sin
2
A
+
cos
2
A
−
2
sin
2
A
cos
A
2
cos
2
A
−
sin
2
A
+
cos
2
A
sin
A
sin
2
A
+
cos
2
A
−
2
sin
2
A
cos
A
2
cos
2
A
−
sin
2
A
−
cos
2
A
tan
A
cos
2
A
−
sin
2
A
cos
2
A
−
sin
2
A
sin
A
sin
2
A
+
cos
2
A
+
2
sin
2
A
cos
A
2
cos
2
A
+
sin
2
A
+
cos
2
A
Prove
that
sin
A
−
2
sin
3
A
2
cos
3
A
−
cos
A
\(=\)
tan
A
.
Proof
:
LHS \(=\)
sin
A
−
2
sin
3
A
2
cos
3
A
−
cos
A
\(=\)
\(=\)
\(=\)
\(=\)
\(=\)
tan
A
\(=\) RHS
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