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25 February, 10:59

If cos45⁰=0.707 find cos (-45⁰)

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  1. 25 February, 14:05
    0
    0.707

    Step-by-step explanation:

    cos in the 4th quadrant is positive as well as in 1st quadrant.

    cos (-45°) is in the 4th quadrant.

    So cos40° must equal cos (-45°) which is 0.707.
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