sec2θ = 2/√3 হলে, θ এর মান কত?
A
60°
B
45°
C
30°
D
15°
উত্তরের বিবরণ
সমাধান:
sec2θ = 2/√3
⇒ sec2θ = sec30°
⇒ 2θ = 30°
⇒ θ = 30°/2
∴ θ = 15°
0
Updated: 1 month ago
যদি tanθ = 0 হয়, তবে sinθ - cosθ =?
Created: 1 month ago
A
2
B
3
C
- 2
D
- 1
প্রশ্ন: যদি tanθ = 0 হয়, তবে sinθ - cosθ =?
সমাধান:
দেওয়া আছে,
tanθ = 0
⇒ tanθ = tan0°
∴ θ = 0°
এখন,
sinθ - cosθ
= sin0° - cos0°
= 0 - 1
= - 1
0
Updated: 1 month ago
(1 - cot260°)/(1 + cot260°) = কত?
Created: 1 month ago
A
2/3
B
1/4
C
- 1/2
D
1/2
সমাধান:
(1 - cot260°)/(1 + cot260°)
= {1 - (1/√3)2}/(1 + (1/√3)2}) [∴ cot60° = 1/√3]
= {1 - (1/3)}/{1 + (1/3)}
= (3 - 1)/(3 + 1)
= 2/4
= 1/2
0
Updated: 1 month ago
sin45° = √2A হলে, A = কত?
Created: 1 month ago
A
2
B
1/2
C
2/3
D
1/3
সমাধান:
দেওয়া আছে,
sin45° = √2A
⇒ 1/√2 = √2A
∴ A = 1/2
0
Updated: 1 month ago
