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Problem
Problem
If in
Δ
A
B
C
\Delta ABC
Δ
A
B
C
,
A
=
90
∘
A = 90^\circ
A
=
9
0
∘
and
c
,
sin
B
c, \sin B
c
,
sin
B
and
cos
B
\cos B
cos
B
are rational number, then a.
a
a
a
is rational b.
a
a
a
is irrational c.
b
b
b
is rational d.
b
b
b
is irrational
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