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Firstly, there are two expressions that you can use to express "no matter", these are:

1.不管 (bùguǎn) ……，都(dōu) /也 (yě)……       OR      2. 无论(wúlùn)/不论(bùlùn)……，都(dōu)/也(yě)……

How do I prove that the differential of coshx is equal to sinhx?

3. The point P lies on the curve with equation y=ln(x/3) The x-coordinate of P is 3. Find an equation of the normal to the curve at the point P in the form y = ax + b, where a and b are constants.

In a sale a bag is reduced by 30%. The bag is now £31.50. Work out the original price of the bag.