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RRB Junior Engineer Stage 1 Model Papers 6
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© examsnet.com
Question : 12
Total: 99
If
cos
A
+
cos
2
A
=
1
then
sin
2
A
+
sin
4
A
is equal to
1
1
2
0
-1
Validate
Solution:
cos
A
=
1
−
cos
2
A
=
sin
2
A
∴
sin
2
A
+
sin
4
A
=
sin
2
A
+
cos
2
A
=
1
© examsnet.com
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