1−cos
2
(α+π)
1−cos(2π−2α)
=2;
\frac{1-cos2 \alpha }{1-cos^2\alpha}=2;
α
1−cos2α
\frac{2sin^2 \alpha }{sin^2\alpha}=2;2=2.
sin
2sin
=2;2=2.
1−cos
2
(α+π)
1−cos(2π−2α)
=2;
\frac{1-cos2 \alpha }{1-cos^2\alpha}=2;
1−cos
2
α
1−cos2α
=2;
\frac{2sin^2 \alpha }{sin^2\alpha}=2;2=2.
sin
2
α
2sin
2
α
=2;2=2.