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Please see the attached image. There are 6 figures.
Please explain the proofs for sin(90  θ) w.r.t the 2nd, 3rd and 4th images. I understand the proof w.r.t 1st image.
In the 2nd image y1 and x is negative. In 3rd image y, y1, x, x1 are all negative and in the 4th image y and x1 are negative. How he gets +ve value for sin(90  θ) w.r.t 2nd, 3rd and 4th figures?
In the 3rd fig. y1 = x and y = x1.
y1/r1 = x/r = cos(θ)
Please explain the proofs for sin(90  θ) w.r.t the 2nd, 3rd and 4th images. I understand the proof w.r.t 1st image.
In the 2nd image y1 and x is negative. In 3rd image y, y1, x, x1 are all negative and in the 4th image y and x1 are negative. How he gets +ve value for sin(90  θ) w.r.t 2nd, 3rd and 4th figures?
In the 3rd fig. y1 = x and y = x1.
y1/r1 = x/r = cos(θ)
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