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(phi^(2)(1-sin theta)(sec theta+tan thet...

(phi^(2)(1-sin theta)(sec theta+tan theta)=1)/((U_(0)P_(0)2015,19))=(2sin)/(2co)

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If (cos theta_(1))/(cos theta_(2))+(sin theta_(1))/(sin theta_(2))=(cos theta_(0))/(cos theta_(2))+(sin theta_(0))/(sin theta_(2))=1 , where theta_(1) and theta_(0) do not differ by can even multiple of pi , prove that (cos theta_(1)*cos theta_(0))/(cos^( 2)theta_(2))+(sin theta_(1)*sin theta_(0))/(sin^(2) theta_(2))=-1

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(1+sin2 theta-cos2 theta)/(1+sin2 theta+cos2 theta)=tan theta

1-(sin^(2) theta)/(1+cos theta) + (1+cos theta)/(sin theta) - (sin theta)/(1-cos theta) - (1)/(sec theta)=