\cos20^\circ+\cos30^\circ+\cos40^\circ=

Correct Answer is : 4cos25°cos30°cos35°

1-2\sin10^\circ\sin15^\circ\sin20^\circ

4\cos20^\circ\cos30^\circ\cos40^\circ

4\cos10^\circ\cos15^\circ\cos20^\circ

4\cos25^\circ\cos30^\circ\cos35^\circ

AP EAMCET Engineering 25 Apr 2017 Shift 1 Paper

Section: Mathematics

Question : 21 of 160

Marks: +1, -0

cos‌20°+cos‌30°+cos‌40°=

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