11. If P + Q + R = 60°, then what is the value of cosQcosR(cosP - sinP) + sinQsinR(sinP - cosP)?
12. The value of $$\left[ {\frac{{{{\sin }^2}{{24}^ \circ } + {{\sin }^2}{{66}^ \circ }}}{{{{\cos }^2}{{24}^ \circ } + {{\cos }^2}{{66}^ \circ }}} + {{\sin }^2}{{61}^ \circ } + \cos {{61}^ \circ }\sin {{29}^ \circ }} \right]$$ is equal to
13. What is $$\sin \alpha - \sin \beta = ?$$
14. If 6tanA(tanA + 1) = 5 - tanA, given that 0 < A < $$\frac{\pi }{2}$$ what is the value of (sinA + cosA)?
15. If tan2A - 6tanA + 9 = 0, 0° < A < 90°, What is the value of 6cotA + $$8\sqrt {10} $$ cosA?
16. If √3tanθ = 3sinθ, then what is the value of sin2θ - cos2θ?
17. If tanθ + cotθ = -2, then the value of tan9θ + cot9θ is:
18. $$\frac{{2 + {{\tan }^2}\theta + {{\cot }^2}\theta }}{{\sec \theta \,{\text{cosec}}\,\theta }}$$ is equal to:
19. What is the value of $$\frac{{3\sin {{58}^ \circ }}}{{\cos {{32}^ \circ }}} + \frac{{3\sin {{42}^ \circ }}}{{\cos {{48}^ \circ }}}$$
20. sin4θ + cos4θ in terms of sinθ can be written as:
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