Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread
tan(90) is undefned.
tan(90) is undefned.
oh. I thought he expanded using compound angles.
That's it. But did you use the formula to find out the acute/obtuse angle?So the question says Find the acute angle and the obtuse angle between the lines:
2x - y + 1 = 0 and 11x - ( 8 + 5squaroot3)y + 5sqrt3 = 0
So I get Thetha = 30 and that is obviously the acute angle
Now finding the obtuse angle, is it as simple as saying 180 - 30 , so 150
The answer is 30, and 150
or is there more working necessary for obtuse angle find ??
what is lim E -> 0 of E^2 / cos^2 E
The answer says 0.
Why is that?? And not 1 ??
Find dy/dx in terms of x and y by differentiating implicitly:
sin x + cos y = 1
It's proved here: https://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities#Proof_of_cosine_identitiesUse the expansion of cos(A+ B) and cos(A-B) to prove that
cosS - cosT = -2sin1/2 (S + T)sin1/2 (S -T)
How do you find the derivative of
y = log base e ( cosx)
what is the derivative of cos^5 3x .