6. Inverse Trigonometry using unit circle or special triangles

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tan( tan -1 (-1))

-1

sin -1 (-1)

-π/2 or -90º

sin -1 (cos(7π/6))

-π/3

sin -1 (-√3/2)

-π/3 or -60º

tan -1 (-√3)

-π/3. or -60º

tan -1 (0)

0. or 0º

sin( cos -1 (-√3/2))

1/2

sin( tan -1 (√3))

1/2

cos -1 (-1/2)

2π/3 or 120º.

cos -1 (cos(3π/4))

3π/4

cos -1 (-√2/2)

3π/4 or 135º.

cos -1 (-√3/2)

5π/6 or 150º.

sin -1 (-3)

undefined

sin -1 (sin(π))

π

cos -1 (-1)

π or 180º.

sin -1 (tan(5π/4))

π/2

sin -1 (-√2/2)

-π/4 of -45º

tan -1 (-1)

-π/4. or -45º

sin -1 (-1/2)

-π/6 or -30º

tan -1 (-√3/3)

-π/6. or -30º

tan( tan -1 (-√3/3))

-√3/3

sin -1 (0)

0 or 0º

cos -1 (1)

0 or 0º.

sin(sin -1 (1/2))

1/2

sin -1 (1)

π/2 or 90º

cos -1 (0)

π/2 or 90º.

sin -1 (√3/2)

π/3 or 60º

cos -1 (1/2)

π/3 or 60º.

tan -1 (√3)

π/3. or 60º

tan -1 (sin(π/2))

π/4

sin -1 (√2/2)

π/4 or 45º

cos -1 (√2/2)

π/4 or 45º.

tan -1 (1)

π/4. or 45º

sin -1 (1/2)

π/6 or 30º

cos -1 (√3/2)

π/6 or 30º.

tan -1 (√3/3)

π/6. or 30º


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