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θ=90°
tan 90°=de/sa=m/1
miring=√m²+1
sinθ=de/mi=m/√m²+1
cosθ=sa/mi=1/√m²+1
Ditanya: sinθ. cosθ...?
Jawab:
Sinθ.cosθ=....
=(m/√m²+1)(1/√m²+1)
=m/m²+1......(E)
Cmiiw