P71155 Weight:1 7) Substitute x = tan e, where e is in the first quadrant, into V3+2x+ and simplify. a) O 3 tane b) O 3 sino c) O 13 sec d) O 3cos e P71160 Weight:1 8) Substitute x cos u, where u is in the first quadrant, into V4-9x2 and simplify. a) 2 sin u b) 2tan u CO2cos u d) 2cot u P71165 Weight:1 9) Simplify tan(90° - 0), given that is an acute angle. a) O cote b) - tan c) O - cot 0 d) O tan