7. Find the period of the function y=tan(2x-π/3). X is not equal to 5π/ 12+kπ/2(k belongs to z).

8 Use the monotonicity of tangent function to compare the values of two functions in the following groups.

(1)tan(-π/5) and tan (-3π/7): (2) tan1519 and tan 1493.

(3)tan(6 9/π 1 1) and Tan (-53/π1/); (4)tan(7π/8) and tan π/6.

9. According to the image of tangent function, write the set of x for which the following inequality holds.

( 1) 1+tanx & gt； =0; (2) Tangent-radical sign 3 >; =0