- How would you use a double angle identity to find tan(2x) given cosx=-5/13 and sinx < 0?

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right triangle trig, pythagorean theorem, double angle identities.

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Is trigonometry used in bearings? and how do you solve a question on bearings in a math test? I have a motor I have to design a fan that makes a bottle travel the longest distance. How can i design its blades to increase air flow? Rounding 1916 to the nearest 10? Physics question friction need help please.? Will a precipitate (ppt) form when 300. mL of 2.0 × 10–5 M AgNO3 are added to 200. mL of 2.5 × 10–9 M NaI?

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