Trigonometri
χ di kuadran IV
cos χ = x/r = a/1
y = √(r² - x²) = √(1 - a²)
Kuadran IV
sin χ = -y/r
tan χ = -y/x
sin χ - tan χ
= -y/r - (-y/x)
= (-xy + ry) / (rx)
= y(r - x) / (rx)
= (1 - a)√(1 - a²) / (1.a)
= (1 - a)√(1 - a²) / a
Opsi : C
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Trigonometri
χ di kuadran IV
cos χ = x/r = a/1
y = √(r² - x²) = √(1 - a²)
Kuadran IV
sin χ = -y/r
tan χ = -y/x
sin χ - tan χ
= -y/r - (-y/x)
= (-xy + ry) / (rx)
= y(r - x) / (rx)
= (1 - a)√(1 - a²) / (1.a)
= (1 - a)√(1 - a²) / a
Opsi : C