The derivative of the function cot^{–1} [(cos 2x)]^{1/2}] at x = π/6 is

a. (2/3)^{1/2}

b. (1/3)^{1/2}

c. 3^{1/2}

d. 6^{1/2}

If then

a.

b.

c.

d. 0

If x = 2 log cot t and y = tan t + cot t, then (sin 2 ) 1

a. cos ...

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