Question 53

If $$sin^{4} A - cos ^{4} A = 1 then \frac{A}{2}$$  then  $$\frac{A}{2}$$  in Degrees is  $$(0< A \leq 90^{0}$$

Solution

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The correct option is B

Check by options. 

If $$\frac{A}{2}$$ = $$45^\circ$$  $$\Rightarrow$$ A = $$90^\circ$$

And A= $$90^\circ$$ Satisfies the given equation.

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