C-09-Q075mediumsingle_mcqIf sinA=725\sin A = \dfrac{7}{25}sinA=257, cosA=?\cos A = ?cosA=?a2425\dfrac{24}{25}2524b724\dfrac{7}{24}247c2524\dfrac{25}{24}2425d725\dfrac{7}{25}257ব্যাখ্যাWith sinA=725\sin A = \dfrac{7}{25}sinA=257, opposite =7=7=7 and hypotenuse =25=25=25, so adjacent =252−72=576=24=\sqrt{25^2-7^2}=\sqrt{576}=24=252−72=576=24. Therefore cosA=adjhyp=2425\cos A = \dfrac{\text{adj}}{\text{hyp}} = \dfrac{24}{25}cosA=hypadj=2524.