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Express 2Cos(a) - Sin(a) in the form RCos(a+b) Give the exact value of R and the value of b in degrees to 2 d.p.

R = 5^0.5

b = 26.57 degrees

Answered by William F. • Maths tutor

4855 Views

What is the difference between 'ils ont' and 'ils sont'?

'Ils ont' means 'they have' in English. It comes from the French verb 'avoir', meaning 'to have'. An example of this might be 'ils ont un chat noir' - 'they have a black cat'.

'Ils sont' sounds qui...

Answered by Marcus G. • French tutor

121597 Views

Explain how the electron pair repulsion theory can be used to deduce the shape of, and the bond angle in, PF3 .

Number of electrons from P= 5 e , Number of electrons from 3F = 3 e , Total number of electrons around P = 8 e Therefore there is a total number of 4 electron pairs surrounding P. three of which are bond ...

Answered by Yusuf A. • Chemistry tutor

3511 Views

How should I answer question 3 of the HAT paper: What can this source tell us about Ratramnus’s understanding of the world, and the means by which he acquired it?

Question 3 of the HAT paper is perhaps the hardest to prepare for since it typically uses obscure sources from periods you're likely to be unfamiliar with. But rather than be alarmed by this, you should r...

Answered by Michael J. • HAT tutor

3672 Views

Describe the events that occur in a reflex action

A reflex action occurs very quickly, and does not involve the brain. The stimulus (e.g. a flame) is sensed by the receptor (the skin). The sensory neurone attached to the receptor sends an impulse to the ...

Answered by Flora B. • Biology tutor

5970 Views