Q.solve if t^2 =n^2 cos^2 (x)+m^2 sin^2 (x) then show that: t+(d^2 t/dx^2 )=(((nm)^2 )/t^3 )


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Question Number 79512 by M±th+et£s last updated on 25/Jan/20

$Q . s o l v e$ $i f t^{2} = n^{2} {c o s}^{2} (x) + m^{2} {s i n}^{2} (x)$ $t h e n s h o w t h a t :$ $t + \frac{d^{2} t}{{d x}^{2}} = \frac{{(n m)}^{2}}{t^{3}}$
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