TS EAMCET · Maths · Trigonometric Ratios & Identities
\(\cos 20^{\circ} \cos 40^{\circ} \cos 60^{\circ} \cos 80^{\circ}=\)
- A \(\frac{3}{8}\)
- B \(\frac{1}{8}\)
- C \(\frac{\sqrt{3}}{8}\)
- D \(\frac{1}{16}\)
Answer & Solution
Correct Answer
(D) \(\frac{1}{16}\)
Step-by-step Solution
Detailed explanation
We have,…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Maths
- If and are the three vertices of a parallelogram , then the angle between its diagonal through and the side isTS EAMCET 2019 Medium
- If the number of diagonals of a regular polygon is 35 , then the number of sides of the polygon isTS EAMCET 2015 Medium
- At any point on a curve, the slope of the tangent is equal to the sum of abscissa and the product of ordinate and abscissa of that point. If the curve passes through , then the equation of the curve isTS EAMCET 2018 Medium
- \(\int \frac{1}{(x-2)\left(x^2+1\right)} d x=\)TS EAMCET 2023 Medium
- If \(M\) and \(N\) are the mid-points of the sides \(B C\) and \(C D\) respectively of a parallelogram \(A B C D\), then \(\mathbf{A M}+\mathbf{A N}\) equalsTS EAMCET 2015 Medium
- If \(P\) is a complex number whose modulus is one, then the equation \(\left(\frac{1+i z}{1-i z}\right)^4=P\) hasTS EAMCET 2019 Easy
More PYQs from TS EAMCET
- The value of \(\frac{d}{d x}\left[\log \left(\sin \sqrt{\frac{x^2+1}{x^2+2}}\right)\right]\) when \(x=\sqrt{2}\), isTS EAMCET 2022 Easy
- Let \(S_r=\{x, y, z) / x+y+z=11, x \geq r, y \geq r\), \(z \geq r, x, y, z, r\) are integers \(\}\) and \(n\left(S_r\right)\) represents the number of elements in \(S_r\). Then \(n\left(S_{2)}+n\left(S_3\right)+n\left(S_4\right)=\right.\)TS EAMCET 2020 Easy
- One mole of alkene \(\underline{X}\) on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of \(\underline{X}\) isTS EAMCET 2009 Easy
- If the root mean square (rms) speed of nitrogen molecules at room temperature is , then the rms speed of Helium molecules at the same temperature isTS EAMCET 2022 Medium
- Find the suitable method from the following to prepare primary amines without the loss of carbons.TS EAMCET 2019 Medium
- If the axes are rotated through an angle \(45^{\circ}\) in the positive direction without changing the origin, then the co-ordinates of the point \((\sqrt{2}, 4)\) in the old system areTS EAMCET 2002 Hard