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How does present perfect work?

Present perfect is the most commonly used past tense in German. It consists of an auxiliary verb and the past participle of the main verb. The auxiliary verb is usually haben conjugated in the present tense ...
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Answered by Emma B. • German tutor
1990 Views

How to calculate sin, cos and tan

SOH CAH TOA (imagining each as a triangle) S = sin C = cos T = tan O = opposite H = hypotenuse A = adjacent
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Answered by Phoebe H. • Maths tutor
3676 Views

Why are teachers now saying electrons are in orbitals? I thought they moved around shells?

Unfortunately, every year in school you are told that something from the previous year was not completely true, and had in fact been simplified...one of the major examples of this is orbitals. While the elec...
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Answered by Findlay M. • Chemistry tutor
2397 Views

How do i approach a long answer question in order to gain full marks?

My approach is to break down the question. In the case of long answer- questions, examiners want to firstly know that you understand a question before answering. Let's use the following example: Explain how ...
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Answered by Silouanos C. • Biology tutor
3922 Views

Use the product rule to differentiate y=2xsinx

The product rule states that y=uv and dy/dx=(u)dv/dx + (v)du/dx. As the equation is in this form we can let u=2x and v=sinx. Therefore du/dx=2 and dv/dx=cosx. Substituting for u and v we get dy/dx=(2x)(cosx)...
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Answered by Georgianna K. • Maths tutor
15721 Views