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? asked in 科學及數學數學 · 1 decade ago

5蚊 8條mc 要解識 易易易

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  • 1 decade ago
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    (71) The curve is y = tan x shifted up by 1 unit, so ans is A.

    (72) The curve is y = sin x magnified by a factor of 3, so ans is B.

    (73) The period of sine curve is doubled and hence the ans is A.

    (75) The curve is negated sine with magnification factor of 3, so ans is A.

    (80) The curve is y = cos x shifted left by 5 degrees, so ans is y = cos (x + 5) = cos [360 - (x + 5)] = cos (355 - x)

    (84) Max. of 2 cos 5x = 2, so ans is D.

    (86) Max. of 3 cos (θ/2) is 3, so ans is D.

    (87) Min. of 2 sin2 3x is zero, so ans is B.

    Source(s): My Maths knowledge
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