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Find the EXACT value of sin(2A) if cscA=5/4

Assume A is a Quadrant I angle in standard position.
sin(2A)=

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Think about what the relationship between sine and cosecant is. 1 over 5/4 is like 1 times 4/5 or just 4/5. Then, what is 2 times 4/5?

cscA = 5/4.
sinA = 4/5,
A = 53.13o.
2A = 106.26o
sin2A = sin106.26 = 0.96 = 96/100 = 24/25.

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