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25 September, 19:17

Which of these is equal to sin (70°) ? A) cos (110°) B) cos (160°) C) cos (20°) D) cos (70°)

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  1. 25 September, 19:31
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    Sin β = cos (90-β)

    sin (70⁰) = cos (90-70⁰) = cos (20⁰)

    sin (70⁰) = cos (20⁰)
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