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Verified answer
Sin a = 6/10x = V(r^2 - y^2)
x = V(10^2 - 6^2)
x = V(100 - 36)
x = V64
x = 8
90° <_ a <_ 180° [kuadran II]
cos a = - 8/10
tan b = - 3/4
r = V(x^2 + y^2)
r = V(4^2 + 3^2)
r = V(16 + 9)
r = V25
r = 5
270° <_ b <_ 360° [kuadran IV)
sin b = - 3/5
Nilai dari cos a + sin b
= - 8/10 + (- 3/5)
= - 8/10 + (- 6/10)
= - 14/10
= - 7/5 (A)