- If 2cosx=z1+1/z1 2cosy=z2+1/z2 2cosz=z3+1/z3 prove z1z2z3=1/z1.1/z2.1/z3?

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WHAT IF A CHILD HAS A DEFICIENCY OF THE 16P CROMOSOME? What is the concentration of hydrochloric acid if 23.3 mL of .1511M NaOH is needed to neutralize a 25.00 mL aliquot of HCL? Please help! solve for x,y,z x+y-2z=5
x+z=4
y-z=6? Bathroom urge not there? Should I take a medicine if I found a dead cockroach in my coffe?