Mathematics, 25.03.2021 23:20 marquetter7689

Evaluate without using a calculator ${ \cos {15}^{2} } + \sin(22.5) \times \cos(22.5) - \ { \ \sin(22.5) }^{2}$

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Evaluate without using a calculator ${ \cos {15}^{2} } + \sin(22.5) \times \cos(22.5) - \ { \ \sin(22.5) }^{2}$