JEE Main & Advanced
Mathematics
Trigonometric Identities
Question Bank
Numerical Value Type Questions - Trigonometric Ratios
question_answer
If \[\alpha \] is the root of \[25\,{{\cos }^{2}}\theta +5\,\,\cos \theta -12=0,\] \[\pi /2<\alpha <\pi ,\] then find the value of \[\sin \,\,2\alpha \] is \[\frac{-k}{25}\] then find k.