1.

If sin 21º = (x / y), then sec 21º – sin 69º is equal to

A. x2 / y√(y2 – x2)
B. y2 / x√(y2 – x2)
C. x2 / y√(x2 – y2)
D. y2 / x √(x2 – y2)
Answer» B. y2 / x√(y2 – x2)


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