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Expand to get xy+3y-4x-12=x^2+y^2Rearrange to xy+3y-4x-12-x^2-y^2
Then you have to differentiate implicitly:
use product rule on xy to get:u = x v =ydu = 1 dv = dy/dx
so xy differentiates t...

. Vaccine contains antigens from the pathogens . This is recognised by helper T cells which activates other helper T cells and B cells . B cells undergo clonal selection and produce memory + plasma cells ...

A typical subjunctive/indicative exercise- my answers are in bold.Il est important que je [venir] ce soir, car ma soeur m'attende. vienne (subj)Je pense...

Firstly, pressure is created by air molecules colliding with a surface. At an increased altitude there are fewer air molecules, and therefore a larger average distance between them. This means at this hig...

Passage"Of course, it would be naïve to suggest that all teenagers can be as accomplished as Malala. However, there is, in fact, considerable evidence that the “unfinished” brain can be pretty good a...