10th Class
Mathematics
Some Applications of Trigonometry
Question Bank
Trigonometry and Its Application
question_answer
If Sin 2\[\alpha \] = 2 Sin\[\alpha \] Cos \[\alpha \] and Sin \[\mathbf{40}{}^\circ \] = m, then the value of Cos\[\mathbf{8}{{\mathbf{0}}^{\mathbf{o}}}\], Cos\[\mathbf{160}{}^\circ \], is equal to