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SAT2数学练习题5道.

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  下面为大家整理的是关于SAT2数学题的练习,共有5道,都是关于代数计算方面的,后面附有详细的答案解析。SAT2数学考试题目虽然简单,但是也需要一些练习来巩固。下面大家就和澳际小编一起来看看这些题目的详细内容吧。

  1.If the value of tan(-2a) is 2, what is the value of tan(2a)?

  (a) -2

  (b) 2

  (c) -4

  (d) 4

  (e) 3

  Answer and Explanation:

  We know that tan(θ) = -tan(-θ), any θ, so tan(2a) = - 2

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  2.What is sec(a)sin(a) + csc(a)cos(a) , if a = 45o?

  (a) 2

  (b) 1

  (c) 1/2

  (d) -1/2

  (e) ¶/2

  Answer and Explanation:

  sec(a)sin(a) + csc(a)cos(a) = [1/cos(a)]sin(a) + [1/sin(a)]cos(a) = sin(a)/cos(a) + cos(a)/sin(a) = (√2/2)/(√2/2) + (√2/2)/(√2/2) = 1 + 1 = 2

  3.What is sin2(a)·cos2(a)·[1 + tan2(a)]?

  (a) tan2(a)

  (b) cos2(a)

  (c) sin2(a)

  (d) sec2(a)

  (e) csc2(a)

  Answer and Explanation:

  sin2(a)·cos2(a)·[1 + tan2(a)] = sin2(a)·cos2(a)·[1 + sin2(a)/cos2(a)] = sin2(a)·cos2(a)·[(cos2(a) + sin2(a))/cos2(a)] = sin2(a)·cos2(a)·[1/cos2(a)] = sin2(a).

  4.What are the polar coordinates of the point with (-5, 5) rectangular coordinates?

  (a) (5√2, 45o)

  (b) (5, 45o)

  (c) (5, 135o)

  (d) (5√2, 135o)

  (e) (-5, 135o)

  Answer and Explanation:

  r2 = 52 + 52, so r = 5√2. tan(θ) = -5/5 = -1 and θ = 135o.

  5.What is the volume of the geometric solid produced by the equilateral triangle in the figure below when it is rotated 360o about the altitude m?

  (a) ¶m3/9

  (b) ¶m2/9

  (c) ¶m3/4

  (d) ¶m3

  (e) m3/9

  Answer and Explanation:

  The solid produced by the triangle rotation will be a cone with a radius equal to half the side of the triangle. We apply Pythagoras Theorem in one of the 2 right triangles created by the altitude m:

  r2 + m2 = (2r)2 r = m/√3 The volume of the cone: Vcone = ¶m(m/√3)2/3 Vcone = ¶m3/9

  以上就是这5道SAT2数学练习题的全部内容,从中我们可以看得出来,SAT2数学题目的难度比SAT数学还是要稍稍难一些的,大家在备考的时候,可以从中发现他们的不同,然后根据特点进行适当的练习。

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