8. \( \tan \left(270^{\circ}+\theta\right) \) संग बराबर हुने त्रिकोणामताय Write the trigonometrical ratio which is equal to \( \tan \left(270^{\circ}+\theta\right) \).

25. यदि लगाउनुहोस् । If \( 9 \cos \theta+40 \sin \theta=41 \), find the value of \( \tan \theta \).

Define the tangent function using an example from a specific right triangle with known angles and side lengths.

23. El menor valor del ángulo \( x\left(0^{\circ} \leq x<180^{\circ}\right) \) que satisface la ecuación trigonométrica \( \cos ^{2}(x)-3 \cdot \operatorname{sen}^{2}(x)=0 \) es: A. \( 120^{\circ} \) B. \( 30^{\circ} \) C. \( 150^{\circ} \) D. \( 60^{\circ} \)

\( a=7, b=5, c=3 \). Find \( \angle A \)

24. प्रमाणित गर्नुहोस् (Prove that): \( \left(\frac{1-\tan \theta}{1-\cot \theta}\right)^{2}=\frac{1+\tan ^{2} \theta}{1+\cot ^{2} \theta} \)