Use the rules given below to find sin 240", cos 225", and tan 225". sin (180* -0) = sin 0, cos (180* -0)= - cos 0, and tan (180* - 0) = - tan () sin (180* + 0) = - sin 0, cos (180* +0) = - cos 0, and tan (180* + 0) = tan 0)A piece of heavy equipment has two 12-foot metal arms Safety chain that make a V with the horizontal plane and form an angle of 120" at their base. A contractor wants to put a chain from the top of one arm to the top of the other arm for 120 12 safety. How long must the chain be? The length of the safety chain should be ft long. (Type an exact answer, using radicals as needed.)The depth of water, d feet, in a channel t hours after midnight is d = 3 cos -t + 11. Find the channel depth at (a) 3 P.M. (low tide). (b) 10 A.M. (high tide)