Question: Use the given substitutions to show that the equations are valid for 0 < /2. If x = cos , show that 1

Use the given substitutions to show that the equations are valid for 0 ≤ θ

If x = cos θ, show that 

1 - x X tan 0.

1 - x X tan 0.

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Given x cos We know that tan sin cos Substituting x cos we get tan sin x We also know that sin2 cos2 ... View full answer

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