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What will you be doing over the Easter break? >>

What will you be doing over the Easter break? >>

A2 Trig Identities

Hiya

I'm sitting my P3 (WJEC) this summer and am just wondering whether anyone could shed any light on getting ALL possible Trig Identities. At the moment I have some, but am not sure whether I have them all. I just want a site or something that has them all written down so I can learn them...

Cheers

\LARGE sin^2x+cos^2x=1\\cosecx=\frac{1}{sinx}\\secx=\frac{1}{cosx}\\cotx=\frac{1}{tanx}\\1+tan^2x=sec^2x\\1+cot^2x=cosec^2x\\sin(A+B)=sinAcosB+cosAsinB\\cos(A+B)=cosAcosB-sinAsinB\\tan(A+B)=\frac{tanA+tanB}{1-tanAtanB}\\(You \ don't \ really \ need \ to \ remember \ the \ (A-B) \ or \ double/half \ angle \ formulae)\\2sinAcosB=sin(A+B)+sin(A-B)

\LARGE 2cosAsinB=sin(A+B)-sin(A-B)\\2cosAcosB=cos(A+B)-cos(A-B)\\2sinAsinB=cos(A-B)-cos(A+B)\\sinP+sinQ=2sin\frac{P+Q}{2}cos\frac{P-Q}{2}\\sinP-sinQ=2cos\frac{P+Q}{2}sin\frac{P-Q}{2}\\cosP+cosQ=2cos\frac{P+Q}{2}cos\frac{P-Q}{2}\\cosQ-cosP=2sin\frac{P+Q}{2}sin\frac{P-Q}{2}

That's the bulk of P2 trig

OP

hey, cheers mate!

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