[" If "a^(2)+b^(2)+2ab cos theta=1,c^(2)...

[" If "a^(2)+b^(2)+2ab cos theta=1,c^(2)+d^(2)+2cd cos theta=1" and "],[ac+bd+(ad+bc)cos theta=0," then prove that "a^(2)+c^(2)=cosec^(2)theta]

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