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The preterite tense indicates a single, completed action in the past. The imperfect indicates a continuous action in the past, a repeated action or a description. Let's take the verb 'comer', to eat, and the...

Starting from the left hand side we can substitute the sin and cos sum and difference formulas. These are sin(A+B) = sinAcosB + cosAsinBand cos(A+B) = cosAcosB - sinAsinBBecause x = A = B when substituted th...

Primary alcohol is the only alcohol which can fully oxidise as it first oxidises to an aldehyde and this can be further oxidised to a carboxylic acid. This is not possible with 2 0 alcohols as they oxidise t...

First we should try and factorise the polynomial the brackets will be (x+?) and (x-?) as the coefficient of x and the -21 have differing signs.just thinking of the factors of 21 we can see that 7-3 = 4 the f...

Literature is brilliant to write about because it is so subjective. There usually isn't a correct answer. Of course, you have to know the basic definition of a symbol, but other than that, most anything can ...