Trigonometry Need to know Flashcards
1
Q
What is the double angle formula for Sin2A?
A
2sinAcosA
2
Q
What is the double angle formula for Cos2A
A
Cos^2(A)Sin^2(A)
Identity of
2cos^2(A) - 1
1 - 2sin^2(A)
3
Q
What is the double angle formula for tan2A?
A
2tanA / 1-tan^2(A)
4
Q
What does sec^2(x) equal?
A
1 + tan^2(x)
5
Q
What does cosec^2(x) equal?
A
1 + cot^2(x)
6
Q
What does secx equal?
A
1/cosx
7
Q
What does cosecx equal?
A
1/sinx
8
Q
What does cotx equal?
A
1 / tanx
Identity of
sinx / cosx
9
Q
What does SinA equal in terms of cos and tan
A
SinA = cosAtanA
