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Mathematics
Mathematics
Problem
Find the value of
(
1
−
sin
2
45
∘
)
×
1
cos
30
∘
\left(1-\sin^{2}45^\circ\right)\times\dfrac{1}{\cos30^\circ}
(
1
−
sin
2
4
5
∘
)
×
cos
3
0
∘
1
. a)
3
4
\dfrac{\sqrt3}{4}
4
3
b)
1
3
\dfrac1{\sqrt3}
3
1
c)
1
1
1
d)
6
3
\dfrac{\sqrt6}{3}
3
6
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