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If 𝗌𝗂𝗇 θ=45, then what is the 𝖼𝗈𝗌(90°−θ)?
sin θ cannot be bigger than 1, so sin θ cannot be 45.
I think you might have meant:
θ = 45º
cos (90º - θ)
= cos (90º - 45º)
= cos (45º)