Find the exact value of the expression. Not a decimal.  Sec [sin ^-1 (2 square root of 5/7)]

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Q: So inverse sine would be a/2 not square root of x^2-64/x.

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A: Explanation of the answer is as follows

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Q: What happens when you try to find A for sin A = 1.234 on your calculator? Why doesit happen?

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Q: Verify the identity. (Simplify at each step.) sin5/2 x cos x – sin9/2 x cos x = cos³ x/ sin5 x…

A: sin2X+cos2X=1 this is formula cos2X=1-sin2X

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Q: Verify the identity. (Simplify at each step.) 5 sin2 x − 5 sin4 x = 5 cos2 x − 5 cos4 x   5 sin2 x…

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Q: please show all steps of how to verify identity  (1-cosx)/(sinx)   +   (sinx)/(1-cosx)  = 2cscx

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.