právní Mužskost ctnost x sin y Další Odlupování Překrytí
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Let x and y be real numbers such that sinx/siny=3 cosx/cosy=1/2 then find the value of sin2x/sin2y+cos2x/cos2y.
Links forward - Inverse trigonometric functions
7.Let siny=xsin (a+y) then dy/dx equals
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Art of Problem Solving
Prove that sinx + sinysinx - siny = tan ( x + y2 ) cot ( x - y2 )