求大神帮我完成这两个题目！！跪求！ 20
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2. (a) make no sense because of arccos (2 sqrt (2)). We know that for arccos (a), `a' belongs to interval [-1, 1].
2. (b) An angle. The value is ArcTan(Pi/3) + ArcCos(Pi/6) = 1.82818
2. (c) make no sense. Tan ( ArcSin(1/2)) = Sqrt (3) > 1
2. (d) A length. The value is 0.99903
3. (a) Draw it yourself.
3. (b) Many intervals. [-1 , -1/2] is one of them.
3. (c) Using the interval [-1, -1/2], we know the inverse function of f is f^-1 (x)= (arcsin (x / 2) - pi) / pi.
2. (b) An angle. The value is ArcTan(Pi/3) + ArcCos(Pi/6) = 1.82818
2. (c) make no sense. Tan ( ArcSin(1/2)) = Sqrt (3) > 1
2. (d) A length. The value is 0.99903
3. (a) Draw it yourself.
3. (b) Many intervals. [-1 , -1/2] is one of them.
3. (c) Using the interval [-1, -1/2], we know the inverse function of f is f^-1 (x)= (arcsin (x / 2) - pi) / pi.
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