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What are the main proofs we need to know in 3u? Things like the trapezoidal rule, simpsons rule and log proofs dont make sense to me...do i still need to learn them and understand them?

1)Suppose z is a complex number that lies on the unit circle 0≤arg(z)≤pi/2 Prove 2arg(z+1)=arg(z)

Why do you need to monitor phosphate? All i have so far is because it can cause algal blooms which kills marine life. Is there anything else i need to add? what is the quantitative test for phosphate? No clue What is the quantitative test for lead? I think its AAS not sure though

So my understanding is that trading blocs are formal agreements that exclude other countries; do free trade agreements also exclude countries, or is it an agreement between set countries that is open to other countries?

Dotpoint 2.6 says analyse progress in the recent development and use of a named biopolymer What are the recent developments of biopol i was thinking about how they take the strain from cupriavidus metallidurans and put it into E.Coli but they started doing that like 10 years ago, is this still...

I)prove cosθ-isinθ=cis(-θ) II)Prove sinθ-icosθ=cis(θ-pi/2)

What are the best website to keep up to date with relevant info (and to put info in your long response to look smart) :D

The complex number z=1+2i is a root of the equation z^2-aiz+b=0 where a and b are real numbers. i) find values of and b ii) Find root of the equation