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OpenStudy (anonymous):
Use the trigonometric identities to transform the left side of the equation into the right side sinθcscθ-sin(90°-θ)secθ=0
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OpenStudy (anonymous):
sin * csc is just equal to 1
OpenStudy (anonymous):
sin(90-theta) = cos(theta) so sin(90-theta)*sec(theta) equal 1 too Therefore-> 1-1=0
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