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Matdas SBno. 6 dilampiran
no. 7
csc x = 1/sin x --> 1/csc x = sin x
y = 1/csc x --> y = sin x
y ≤ 1 + 2/y ---> kalikan y
y² ≤ y + 2 atau y² - y - 2 ≤ 0
(y - 2)(y +1) ≤ 0
y ≥ 2 atau y ≤ - 1
y = 2 --> sin x≥2 (tidak mungkin)
y = - 1 --> sin x≤ - 1
x ≤ 270 --> x ≤ 3/2 π
pada interval 0 ≤ x ≤ 2π
HP x --> 0 ≤ x ≤ 3/2 π
no. 8
sin (-x) = - sin x
sin⁻¹ (x) + sin⁻¹ x) =
= sin⁻¹ (x) - sin⁻¹ (x)
= 0