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RRB JE Stage I 23 May 2019 Shift 1 (HM)
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© examsnet.com
Question : 5
Total: 100
cos
4
A
−
sin
4
A
का मान ज्ञात कीजिए।
0
sin
2
A
+
cos
2
A
2
cos
2
A
Validate
Solution:
cos
4
A
−
sin
4
A
=
(
cos
2
A
)
2
−
(
sin
2
A
)
2
=
(
cos
2
A
+
sin
2
A
)
(
cos
2
A
−
sin
2
A
)
=
cos
2
A
[
∵
cos
2
A
+
sin
2
A
=
1
]
© examsnet.com
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