11.
If θ be a positive acute angle satisfying cos2θ + cos4θ = 1, then the value of tan2θ + tan4θ is?

12.
If $${\text{tan}}\theta = \frac{4}{3}{\text{,}}$$   then the value of $$\frac{{3\sin \theta + 2{\text{cos}}\theta }}{{3\sin \theta - 2{\text{cos}}\theta }}$$   is?

13.
The simplified value of (secA - cosA)2 + (cosecA - sinA)2 - (cotA - tanA)2

14.
The angles of a triangle are (x + 5)°, (2x - 3)° and (3x + 4)°. Then the value of x is?

15.
The expression $$\frac{{\tan {{57}^ \circ } + \cot {{37}^ \circ }}}{{\tan {{33}^ \circ } + \cot {{53}^ \circ }}}$$    is equal to?

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