Explanation: 
Another Explanation (5):
দেওয়া আছে, cosθ = 12/13
আমরা জানি, sin²θ + cos²θ = 1
সুতরাং, sin²θ = 1 - cos²θ
⇒ sin²θ = 1 - (12/13)²
⇒ sin²θ = 1 - 144/169
⇒ sin²θ = (169 - 144)/169
⇒ sin²θ = 25/169
⇒ sinθ = ±√(25/169)
⇒ sinθ = ±5/13
আমরা জানি, tanθ = sinθ / cosθ
সুতরাং, tanθ = (±5/13) / (12/13)
⇒ tanθ = ±(5/13) * (13/12)
⇒ tanθ = ±5/12
অতএব, tanθ = ±5/12 🥳