Practicing Success
If $21 \tan \theta = 20$, then $(1 + \sin \theta + \cos \theta) : (1 - \sin \theta + \cos \theta) = ?$ |
5 : 2 3 : 1 2 : 1 7 : 3 |
7 : 3 |
21 tanθ = 20 { using , tanθ = \(\frac{P}{B}\) } tanθ = \(\frac{20}{21}\) By using pythagoras theorem , P² + B² = H² 20² + 21² = H² H = 29 Now, ( 1 + sinθ + cosθ ) : ( 1 - sinθ + cosθ ) ( 1 + \(\frac{P}{H}\) + \(\frac{B}{H}\) ) : ( 1 - \(\frac{P}{H}\) + \(\frac{B}{H}\) ) ( 1 + \(\frac{20}{29}\) + \(\frac{21}{29}\) ) : ( 1 - \(\frac{20}{29}\) + \(\frac{21}{29}\) ) ( 29 + 20 + 21 ) : ( 29 - 20 + 21 ) 70 : 30 7 : 3 |