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Exercise 1.10

The statement cos ⁡ x is sin ⁡ ( π 2 − x ) implies what about arccos ⁡ y and arcsin ⁡ y ?

Solution:

That cos ⁡ x = sin ⁡ ( π 2 − x ) implies that the angle whose cosine is y is π 2 minus the angle whose sine is y . In other words, we have: a cos ⁡ y + a sin ⁡ x = π 2 .

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