tanθ = Cotθ হলে θ এর মান কত?
A
30°
B
45°
C
60°
D
90°
উত্তরের বিবরণ
সমাধান:
দেওয়া আছে,
tanθ = Cotθ
⇒ tanθ = 1/tanθ
⇒ tan2θ = 1
⇒ tanθ = √1 = 1
⇒ tanθ = tan45°
∴ θ = 45°
0
Updated: 1 month ago
sec2θ + cosec2θ = ?
Created: 1 month ago
A
cosec2θ
B
tan2θ
C
sec2θ. cosec2θ
D
tan2θ. cot2θ
সমাধান:
sec2θ + cosec2θ
= (1/cos2θ) + (1/sin2θ)
= (sin2θ + cos2θ)/(cos2θ. sin2θ)
= 1/(cos2θ. sin2θ)
= (1/cos2θ). (1/sin2θ)
= sec2θ. cosec2θ
0
Updated: 1 month ago
cosec(90° - θ) = 3 হলে, cosθ = কত?
Created: 1 month ago
A
3
B
√3
C
1/3
D
1/√3
সমাধান:
cosec(90° - θ) = 3
বা, secθ = 3
বা, 1/cosθ = 3
∴ cosθ = 1/3
0
Updated: 1 month ago
