IIT-JEE Exam

Prove that cos
π
14
FH G
IK J
+ cos
3
14
π FH G
IK J
+ cos
5
14
π FH G
IK J

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IIT-JEE Other Question

A + B + C = π
Prove that, cos2 A + cos2 B + cos2 C =
1 – 2 cosA cosB cosC A physical quantity is measured and the result
is expressed as nu where u is the unit used
and n is the numerical value. If the result is
expressed in various units then :
(A) n ∝ size of u (B) n ∝ u2
(C) n ∝ u (D) n ∝ u
1