tanθ = √3 হলে cosθ = ?
A
√3/2
B
1/√2
C
1/2
D
1
উত্তরের বিবরণ
প্রশ্ন: tanθ = √3 হলে cosθ = ?
সমাধান:
আমরা জানি,
sec2θ - tan2θ = 1
⇒ sec2θ - (√3)2 = 1
⇒ sec2θ - 3 = 1
⇒ sec2θ = 1 + 3
⇒ sec2θ = 4
⇒ secθ = 2
⇒ 1/cosθ = 2
⇒ cos = 1/2
0
Updated: 5 hours ago
tanθ = Cotθ হলে θ এর মান কত?
Created: 1 week ago
A
30°
B
45°
C
60°
D
90°
সমাধান:
দেওয়া আছে,
tanθ = Cotθ
⇒ tanθ = 1/tanθ
⇒ tan2θ = 1
⇒ tanθ = √1 = 1
⇒ tanθ = tan45°
∴ θ = 45°
0
Updated: 1 week ago
cosA secA + 2 এর মান কত?
Created: 1 week ago
A
3
B
1
C
8
D
4
সমাধান:
cosA secA + 2
= cosA (1/cosA) + 2
= 1 + 2
= 3
0
Updated: 1 week ago
cos45° ⋅ cos15° + sin45° ⋅ sin15° = ?
Created: 1 week ago
A
1/√2
B
1/√3
C
√3/2
D
√3/2
সমাধান:
আমরা জানি,
cosA cosB + sinA sinB = cos(A - B)
এখন,
cos45° cos15° + sin45° sin15°
= cos(45° - 15°)
= cos30°
= √3/2
0
Updated: 1 week ago
