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The value of \({\cos }^{2}10^\circ -\cos 10^\circ \cos 50^\circ +{\cos }^{2}50^\circ\) is [JEE Main 2019, 9 Apr (Shift 1…

Q1

The value of \({\cos }^{2}10^\circ -\cos 10^\circ \cos 50^\circ +{\cos }^{2}50^\circ\) is

[JEE Main 2019, 9 Apr (Shift 1)]

a

\(\frac{3}{4}+\cos 20^\circ\)

b

\(\frac{3}{4}\)

c

\(\frac{3}{2}(1+\cos 20^\circ )\)

d

\(\frac{3}{2}\)

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