List IList II(1)cos21∘−cos22∘2sin3∘sin1∘ is equal to(p)−1(2)sin(−870∘)+cosec(−660∘)+tan(−855∘)+2cot(840∘)+cos(480∘)+sec(900∘)(q)12(3)If cosθ=45 where θ∈(3π2,2π) andcosα=35 where α∈(0,π2) thencos(θ−α) has the value equal to(r)0Which of the following is the correct combination?

List IList II(1)cos21∘−cos22∘2sin3∘sin1∘ is equal to(p)−1

1.	List IList II(1)cos21∘−cos22∘2sin3∘sin1∘ is equal to(p)−1(2)sin(−870∘)+cosec(−660∘)+tan(−855∘)+2cot(840∘)+cos(480∘)+sec(900∘)(q)12(3)If cosθ=45 where θ∈(3π2,2π) andcosα=35 where α∈(0,π2) thencos(θ−α) has the value equal to(r)0Which of the following is the correct combination?
Answer» $\begin{matrix} List I & List II (1) & \frac{{cos}^{2} 1^{\circ} - {cos}^{2} 2^{\circ}}{2 sin 3^{\circ} sin 1^{\circ}} is equal to & (p) & - 1 (2) & sin (- 870^{\circ}) + cosec (- 660^{\circ}) + tan (- 855^{\circ}) + 2 cot (840^{\circ}) + cos (480^{\circ}) + sec (900^{\circ}) & (q) & \frac{1}{2} (3) & If cos θ = \frac{4}{5} where θ \in (\frac{3 π}{2}, 2 π) and cos α = \frac{3}{5} where α \in (0, \frac{π}{2}) then cos (θ - α) has the value equal to & (r) & 0 \end{matrix}$ Which of the following is the correct combination?