Find sin2x for each given the following condition:

a) sin x = 4/5 for 90^{o}< x < 180^{o}

b)tan x = -2 for 3pi/2 < x < 2pi

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- December 28th 2012, 11:40 AMalejandroFind sin2x for each given the following condition:
**Find sin2x for each given the following condition:**

**a) sin x = 4/5 for 90**^{o}< x < 180^{o}

b)tan x = -2 for 3pi/2 < x < 2pi - December 28th 2012, 01:02 PMzachd77Re: Find sin2x for each given the following condition:
- December 28th 2012, 01:18 PMSorobanRe: Find sin2x for each given the following condition:
Hello, alejandro!

Quote:

We are given: .

Angle is in a right triangle with:

Pythagorus says:

Since in Quadrant 2,

Identity: .

Therefore: .

Quote:

Since is in Quadrant 4, we have: .

Angle is in a right triangle with:

Pythagorus says: .

Therefore: .