[Merged by Bors] - feat(analysis/special_functions/trigonometric/angle): twice angles adding to π
#17822
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…ding to `π` Add lemmas that, if twice two angles add to `π`, the absolute value of the cosine of one equals the absolute value of the sine of the other.
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Dec 5, 2022
…ding to `π` (#17822) Add lemmas that, if twice two angles add to `π`, the absolute value of the cosine of one equals the absolute value of the sine of the other.
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Add lemmas that, if twice two angles add to
π, the absolute value of the cosine of one equals the absolute value of the sine of the other.