This equation $cos 2theta = cos^2 theta - sin^2 theta = 2 cos^2 theta - 1$ is inline.
勾股定理：[a^2+b^2=c^2]。
微积分基本定理：
$$int_a^b{f’(x)dx}=f(b)-f(a)$$
This equation $cos 2theta = cos^2 theta - sin^2 theta = 2 cos^2 theta - 1$ is inline.
勾股定理：[a^2+b^2=c^2]。
微积分基本定理：
$$int_a^b{f’(x)dx}=f(b)-f(a)$$
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