Simplify sec(arcsin(x-1))

Math
Draw a triangle in the plane with vertices , , and the origin. Then is the angle between the positive x-axis and the ray beginning at the origin and passing through . Therefore, is .
Simplify the denominator.
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Since both terms are perfect squares, factor using the difference of squares formula, where and .
Simplify.
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Subtract from .
Add and .
Apply the distributive property.
Multiply by .
Add and .
Multiply by .
Combine and simplify the denominator.
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Multiply and .
Raise to the power of .
Raise to the power of .
Use the power rule to combine exponents.
Add and .
Rewrite as .
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Rewrite as .
Apply the power rule and multiply exponents, .
Combine and .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Simplify.
Factor out of .
Rewrite as .
Factor out of .
Rewrite negatives.
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Rewrite as .
Move the negative in front of the fraction.
Simplify sec(arcsin(x-1))

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