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26 April, 02:28

If csc theta=-5/4 and theta is between 180 and 270 what is the value of cos

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  1. 26 April, 02:55
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    To solve the question for cos θ will be found as follows:

    csc θ=-5/4

    but

    csc θ=1/sin θ

    thus

    sin θ=-4/5

    thus

    θ=arcsin (-4/5)

    θ=-53.130

    but since the value lies between 180 and 270, our value will be:

    180 - (-53.130) = 233.16

    thus

    cos233.16=-0.59958
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