Sin( 90 theta ) = cos theta prove this using coordinate axes

Sin( 90 theta ) = cos theta prove this using coordinate axes
Sin- 90 - theta - - cos theta prove this using coordinate axes

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Sin 90 Degrees: Formula, Examples, Questions

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Prove the following :i sinθsin90∘ θ cosθcos90∘ θ=0ii cos 90∘ θ

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Why Sin (90-theta) = Cos (theta)?