Question

Which of the following are identities?

A. sin6(x)=2sin3(X)cos3(x)

B. (sin(x)+cos(x))^2=1+sin^2(x)

C. sin3(x)-sin(x)/cos3(x)+cos(x)=tan(x)

D. sin3(x)/sin(x)cos(x)=4cos(x)-sec(x)

Answer 1

A for sure is one of the options...let me check the rest...

Answer 2

B false...

Answer 3

https://www.symbolab.com/solver/trigonometric-identity-calculator/Prove%20%5Cfrac%7Bsin3x-sinx%7D%7Bcos3x%2Bcosx%7D%3Dtanx/?origin=enterkey

Answer 4

I got C

Answer 5

So it would be A and C

Answer 6

and D

Answer 7

I tried solving D on the website you o on and it said cannot solve :/

Answer 8

But okay A,C, and D

Answer 9

https://www.symbolab.com/solver/trigonometric-identity-calculator/Prove%20%5Cfrac%7Bsin3x%7D%7Bsinxcosx%7D%3D4cosx-secx/?origin=enterkey

Answer 10

I typed it the same way you did :/
that's weird

Answer 11

All were correct....

Answer 12

lol...ok im off to bed good night every one..except "B"

Answer 13

good night