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g(x) = x - 2f(x)
= x - 2(1 - 3x)
= x - 2 + 6x
= 7x - 2
g(1) = 7(1) - 2 = 5
maka: f(g(1)) = f(5)
= 1 - 3(5)
= -14
2) sin α = a/b
cos α = √(b² - a²) /b
maka sec α = 1/cos α
= b/√(b² - a²)