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potat_o
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Recent content by potat_o
P
hsc science and maths questions sorted by topic
Me please :)
potat_o
Post #30
Aug 21, 2018
Forum:
General Discussion on the 2018 HSC
P
trig identities question
Using sin(A+B) = (sin A) cos(B) + cos(A) sin(B) and sin(A-B) = (sin A) cos(B) - cos(A) sin(B) To prove sin ( θ + α ) sin ( θ − α ) = sin^2θ − sin^2a Taking the LHS, sin ( θ + α ) sin ( θ − α ) = [sin(θ)cos(a)+cos(θ)sin(a)] [sin(θ)cos(a)-cos(θ)sin(θ)] =sin^2θcos^2a-cos^2θsin^2a (Expanding and...
potat_o
Post #3
Jan 25, 2018
Forum:
Mathematics Extension 1
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