JEE MATHEMATICS MCQ: MULTIPLE AND SUBMULTIPLE ANGLES

1 Medium

1 of 1

Analyzing +4 | -1

5\left(\tan ^{2} x-\cos ^{2} x\right)=2 \cos 2 x+9

, then the value of

\cos 4 x

View answer and explanation

Correct option: A

-\frac{7}{9}

Option A (-7/9) is correct because after simplifying the given equation and solving for

\cos 2x

, we can find

\cos 4x

which equals -7/9.

More Questions from MULTIPLE AND SUBMULTIPLE ANGLES

Practice All Chapter MCQs →

1 + \cos \,\,x = k

x

\sin \,\,\frac{x}{2}

\sin 12^\circ \cdot \sin 48^\circ \cdot \sin 54^\circ =

\alpha ,\;\,\,\beta \left( {\alpha \ne \beta } \right)

a\,\,\cos \,\,\theta + b\,\,\sin \,\,\theta = c

\tan \,\,\left( {\frac{{\alpha + \beta }}{2}} \right)

{\cos ^4}\theta - {\sin ^4}\theta

\cos ^{2} 10^{\circ}-\cos 10^{\circ} \cos 50^{\circ}+\cos ^{2} 50^{\circ}

\triangle P Q R, \angle R=\frac{\pi}{2}

\tan \left(\frac{P}{2}\right)

\tan \left(\frac{Q}{2}\right)

a x^2+b x+c=0, a \neq 0