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6 August, 08:42

Without using trignometery tables find value of, cos70/sin20+cos57. cosec33 - 2cos60

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  1. 6 August, 09:04
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    Here is some thoughts on this:

    cos 57 = sin (90-57) = sin 33

    so cos 57. cosec 33 = cos 57 / sin 33 = sin 33 / sin33 = 1

    2 cos 60 = 2 * 1/2 = 1

    so the last 2 parts work out to 0

    now we have to find cos 70 / sin 20

    sin 20 = cos 70 so this comes to 1

    so finally the answer is 1
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