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Official 2019 Paper 1 · Q19

Paper 1TrigonometrySequences & series

Find the value of

∑k=090sin⁡(10+90k)∘\sum_{k=0}^{90}\sin(10+90k)^\circ
A00
Bsin⁡10∘\sin10^\circ
Csin⁡100∘\sin100^\circ
Dsin⁡190∘\sin190^\circ
Esin⁡280∘\sin280^\circ
F11

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