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Standard XII
Mathematics
Trigonometric Ratios of Multiples of an Angle
Prove that Si...
Question
Prove that Sin3x+sin2x-sinx=4sinx * cos(x/2)*cos(3*x/2)
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Similar questions
Q.
Prove that :
sin
x
−
sin
3
x
sin
2
x
−
cos
2
x
=
2
sin
x
Q.
Prove that
cos
3
x
−
sin
3
x
cos
x
−
sin
x
=
1
2
(
2
+
sin
2
x
)
Q.
Prove that:
sin
3
x
+
sin
2
x
−
sin
x
=
4
sin
x
cos
x
2
,
cos
3
x
2
.
Q.
Solve the following equations:
(i)
cos
x
+
cos
2
x
+
cos
3
x
=
0
(ii)
cos
x
+
cos
3
x
-
cos
2
x
=
0
(iii)
sin
x
+
sin
5
x
=
sin
3
x
(iv)
cos
x
cos
2
x
cos
3
x
=
1
4
(v)
cos
x
+
sin
x
=
cos
2
x
+
sin
2
x
(vi)
sin
x
+
sin
2
x
+
sin
3
=
0
(vii)
sin
x
+
sin
2
x
+
sin
3
x
+
sin
4
x
=
0
(viii)
sin
3
x
-
sin
x
=
4
cos
2
x
-
2
(ix)
sin
2
x
-
sin
4
x
+
sin
6
x
=
0
Q.
Prove that
sin
x
−
sin
3
x
sin
2
x
−
cos
2
x
=
2
sin
x
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Trigonometric Ratios of Multiples of an Angle
Standard XII Mathematics
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