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RRB Assistant Loco Pilot and Technician Model Paper 10 with solutions
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© examsnet.com
Question : 16
Total: 75
cosec
A
cosec
A
–
1
+
cosec
A
cosec
A
+
1
is equal to
1
sec
2
A
cosec
2
A
2
sec
2
A
Validate
Solution:
cosec
A
cosec
A
–
1
+
cosec
A
cosec
A
+
1
⇒
cosec
A
(
cosecA
+
1
)
+
cosec
A
(
cosec
A
–
1
)
cosec
2
A
–
1
⇒
cosec
2
A
+
cosec
A
+
cosec
2
A
–
cosecA
cosec
2
A
–
1
⇒
2
cosec
2
A
cosec
2
A
–
1
⇒
2
cosec
2
A
cot
2
A
⇒
2
cosec
2
A
cos
2
A
sin
2
A
⇒
2
cosec
2
A
⋅
sin
2
A
cos
2
A
⇒
2
cosec
2
A
⋅
1
cosec
2
A
cos
2
A
⇒
2
cos
2
A
= 2
sec
2
A
© examsnet.com
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