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26 July, 11:00

2. Why does the sin Ɵ = cos (90 - Ɵ) ?

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  1. 26 July, 12:09
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    R. H. S:

    = cos (90 - theta)

    = cos (90) cos (theta) + sin (90) sin (theta)

    = 0 + sin (theta) = >[ cos (90) = 0, sin (90) = 1]

    = sin (theta)
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