Find the value of each expression without using a calculator. 1.) a. sin 180° b. cos 180° 2.) a. sin(-90)° b. cos(-90)° 3.) a. sin(-7) 4.) a. cos 2π b. cos π b. sin(-) c. sin 270° c. sin 360° c. sin 3π 2 c. sin 37 d. cos 270° d. cos 360° d. cos It d. cos(-377)

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