Trigonometry Examples

$\cos (\frac{π}{2} + a) \cos (\frac{π}{2} - a) - \sin (\frac{π}{2} + a) \sin (\frac{π}{2} - a)$

Step 1

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$\cos (\frac{π}{2} + a) \cos (\frac{π}{2} - a) - \sin (\frac{π}{2} + a) \sin (\frac{π}{2} - a)$