- How do you write a complex number in trigonometric form? For example z=-4?

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If a,b are real number , show that |a+b|=|a|+|b| if and only if ab >=0? What is the value of x?
74-13x=35? If f is an exponential function of the form f(x)=C(a^x) with a growth factor 2 and f(5)=11. What is f(6)? Please? A deep-sea diver uses a gas cylinder with a volume of 10.0 L and a content of 51.8g of O 2 and 32.3g of He .? A planet that revolves in an elliptical orbit around our sun and companion star is the orbit equidistant from our sun?
Case like Nibiru.?

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