21.
2cosec223° cot267° - sin223° - sin267° - cot267° is equal to?

22.
$$\frac{{{\text{tan}}\theta }}{{1 - {\text{cot}}\theta }}{\text{ + }}\frac{{{\text{cot}}\theta }}{{1 - {\text{tan}}\theta }}$$     is equal to?

23.
The value of (1 + cotθ - cosecθ)(1 + tanθ + secθ) is equal to?

24.
If $$x = a{\text{ }}\sec \theta .\cos \phi ,$$     $$y = b{\text{ }}\sec \theta .sin\phi ,$$     $$z = c{\text{ tan}}\theta {\text{.}}$$   then the value of $$\frac{{{x^2}}}{{{a^2}}}$$  + $$\frac{{{y^2}}}{{{b^2}}}$$  - $$\frac{{{z^2}}}{{{c^2}}}$$  is?

25.
The numerical value of $$\frac{1}{{1 + {{\cot }^2}\theta }}$$   + $$\frac{3}{{1 + {\text{ta}}{{\text{n}}^2}\theta }}$$   + $$2{\sin ^2}\theta $$   will be?

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