Tube lessons

1)

The value of \(cos18^{0}\) + \(cos162^{0}\) +\(cos234^{0}\) + \(cos306^{0}\) is

2)

The value of \(tan\frac{3\pi}{20}tan\frac{4\pi}{20}tan\frac{5\pi}{20}tan\frac{6\pi}{20}tan\frac{7\pi}{20}\) is

3)

The value of \(cos^{2}\frac{\pi}{4} + sin^{2}\frac{3\pi}{4} + sin^{2}\frac{5\pi}{4} + sin^{2}\frac{7\pi}{4}\)

4)

If \(4\theta\)=\(11\pi\) then the value of \(\frac{sin(-\theta)+cos(-\theta)}{sec\theta-tan(-\theta)}\)

5)

If \(sin\theta\) + \(cos\theta\) = 0,and \(\theta\) lies in the fourth quadrant,then \(cos\theta\) is

Mathematics