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Mathematics
Problem
For an acute angle
A
A
A
,
3
sin
A
=
4
cos
A
3 \sin A = 4 \cos A
3
sin
A
=
4
cos
A
. Find the value of
sin
2
A
−
cos
2
A
\sin^{2} A - \cos^{2} A
sin
2
A
−
cos
2
A
. a)
1
1
1
b)
−
7
25
-\dfrac{7}{25}
−
25
7
c)
7
25
\dfrac{7}{25}
25
7
d)
1
5
\dfrac{1}{5}
5
1
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