NCERT Class 10 Maths Solutions Chapter - 8 Trigonometry, Ex - 8.2

Ex - 8.2

Question 1.

Solution

Question 2.Choose the correct option and justify your choice.

(A).   sin60°
(B).   cos60°
(C).   tan60°
(D).   sin30°

(A).   tan90°
(B).   1
(C).   sin45°
(D).   0
(iii).   sin2A = 2sinA is true when A =
(A).   0°
(B).   30°
(C).   45°
(D).   60°

(A).   cos60°
(B).   sin60°
(C).   tan60°
(D).   sin30°

Solution

Question 3.

Solution

Question 4.State whether the following are true or false. Justify your answer.
(i).    sin(A + B) = sinA + sinB
(ii).   The value of sinθ increases as θ increases
(iii). The value of cosθ increases as θ increases
(iv). sinθ = cosθ for all values of θ
(v).   cotA is not defined for A = 0�

Solution