ChallengeMedium ShareChallenge · Medium problemCompute cos21∘+cos22∘+cos23∘+⋯+cos290∘\cos^{2}1^{\circ}+\cos^{2}2^{\circ}+\cos^{2}3^{\circ}+\cdots+\cos^{2}90^{\circ}cos21∘+cos22∘+cos23∘+⋯+cos290∘.Express your answer as a common fraction.Check Show answer Walk through it step by step Practice more like this