tmua 2019 Q19

tmua · Uk · paper1 1 marks Standard trigonometric equations Evaluate trigonometric expression given a constraint

Find the value of
$$\sum_{k=0}^{90} \sin(10 + 90k)^{\circ}$$

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Find the value of

$$\sum_{k=0}^{90} \sin(10 + 90k)^{\circ}$$