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  1. If sin 17° = (x / y) , then the value of (sec 17° – sin 73°) is
    1. x√y² - x²
    2. y√y² - x²
    3. y√x² - y²
    4. x√x² - y²
Correct Option: B

sin 17° =
x
y

cos 17° = √1 - sin² 17°


=
y² - x²
y

∴ sec 17° =
y
y² - x²

sin 73° = sin (90° – 17°) = cos 17°
∴ sec 17°– sin 73°
=
y
-
y² - x²
y² - x²y

=
y² - y² + x²
=
y√y² - x²y√y² - x²



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