find the absolute and local maximum and minimum values off.

-pi/2 ≤ t ≤ 3pi/2

i have no clue how to solve this because cos(-π/2) and cos(3π/2) equal 0 but the answer isn't zero.

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- November 18th 2009, 03:13 PMbreakabsolute and local maximum and minimum
find the absolute and local maximum and minimum values of

*f*.

-pi/2 ≤ t ≤ 3pi/2

i have no clue how to solve this because cos(-*π*/2) and cos(3*π*/2) equal 0 but the answer isn't zero. - November 18th 2009, 03:40 PMskeeter