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tmua.fyi Mock Paper 1 · Q18

Paper 1Trigonometry

Evaluate cos⁡21∘+cos⁡22∘+cos⁡23∘+⋯+cos⁡289∘\cos^2 1^\circ+\cos^2 2^\circ+\cos^2 3^\circ+\cdots+\cos^2 89^\circ.

A4545
B44.544.5
C4444
D8989
E88.588.5

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