Determine how many crayfish may be stocked at 20 crayfish/sq meter in a 1000 gallon circular tank of 3 ft deep and 6 ft in diameter.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b