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Ch.8 Introduction to Trigonometry
Extra Important questions
Assignment
1
1. If 𝑠𝑖𝑛𝜃 = , then 𝑠𝑒𝑐𝜃 =
3
2√3 3 2 1
(a) (b) (c) (d)
3 2√2 √3 √2
2. For what value of θ, 𝑠𝑖𝑛 𝜃 + 𝑠𝑖𝑛𝜃 + 𝑐𝑜𝑠 2 𝜃 is equal to 2?
2

(a) 300 (b) 450 (c) 600 (d) 900
𝛼+𝛽
3. If 𝑐𝑜𝑠(𝛼 + 𝛽) = 0, then 𝑐𝑜𝑠 ( )=
2
√3 1
(a) (b) (c) 1 (d) 0
2 √2
4𝑠𝑖𝑛𝜃+3𝑐𝑜𝑠𝜃
4. If 2𝑡𝑎𝑛𝜃 = 3 , then =
4𝑠𝑖𝑛𝜃−3𝑐𝑜𝑠𝜃
1
(a) 0 (b) 3 (c) (d) none of these
6
5𝑠𝑖𝑛𝜃−2𝑐𝑜𝑠𝜃
5. If 5𝑡𝑎𝑛𝜃 = 4 , then =
5𝑠𝑖𝑛𝜃+3𝑐𝑜𝑠𝜃
1 2 3
(a) (b) (c) (d) none of these
3 5 5
5
6. 𝑠𝑒𝑐 2 600 − 𝑡𝑎𝑛2 600 + 𝑐𝑜𝑐 2 450 =
8
−5 −1 −1
(a) (b) (c) 0 (d)
3 2 4
7. If 𝜃 is and acute angle and 7 + 4 sin𝜃 = 9 ,then the value of 𝜃 is:
(a) 300 (b) 450 (c) 600 (d) 900
𝑠𝑒𝑐𝜃
8. The value of 𝑡𝑎𝑛2 𝜃 − =
𝑐𝑜𝑠𝜃
(a) 1 (b) 0 (c) − 1 (d) 2
9. If 𝛼 + 𝛽 = 900 and 𝛼 = 2𝛽, then 𝑐𝑜𝑠 2 𝛼 + 𝑠𝑖𝑛2 𝛽 =
1
(a) 0 (b) (c) 1 (d) 2
2
10.The value of (𝑡𝑎𝑛𝐴 𝑐𝑜𝑠𝑒𝑐𝐴)2 − (𝑠𝑖𝑛𝐴 𝑠𝑒𝑐𝐴)2 is :

(a) 0 (b) 1 (c) − 1 (d) 2

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