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The perfect tense is used frequently in both English and Spanish to express completed actions in the past. It is formed with the auxillary verb "to have" and the past participle of the verb that...

The flying theme from ET shows flight through the ascending motif, first raising by a 5th in bar 8, then an octave in bar 10 and finally a minor 6th in bar 12. The use of the major key also highlights the...

Firstly, we may simplify the expression by factoring out any constants. In this case 5 can be factored out. 

5 ∫ cos(3x-1) dx 

For the integrand cos(3x -1), we can use a simple u-substitutio...

1. The auxiliary verb is equivalent to the english "have" in tenses such as "I have eaten", for example. "J'ai mangé. This verb agrees with the subject. 2) The normal auxiliary...

The islets of Langerhans contain alpha and beta cells. Alpha cells produce and secrete glucagon. Beta cells produce and secrete insulin.