Question

please solve my question correctly correctly correctly.........don't spam.....explanation must....​

Answer 1

From given attachment ,

sin@ = 1/√5 = p/h

SO, Cos@ = b/h = √h²-p²/h =√ (5)²-(1)²/ √5 = 2/√5

so , here Proved , cos@ = +-2/√5

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