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Mathematics
Mathematics
Problem
Explain, in at most two sentences, why
1
−
sin
2
θ
cos
2
θ
=
1
\dfrac{1-\sin^{2}\theta}{\cos^{2}\theta}=1
cos
2
θ
1
−
sin
2
θ
=
1
for any acute angle
θ
\theta
θ
.
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