- Why do we need the reciprocal trig functions if they're just the opposite of the normal ones?

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Is three days enough to study for a calculous test? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? Why erythrocytes have a light section in the middle? A 25.0mL solution containing .60M HCl was titrated with 0.50M NaOH. Calculate the pH before the titration and at equivalence point? I need news on the tremors/aftershocks/earthquake I am feeling in Maricopa county Arizona.?