Pythagorean Identities:
Example:
Cosx = 2/3....Find Secx
This is one of the easier problems. Since Secx is the opposite of Cosx, all you have to do is flip the equation to get the final answer.
Example:
Cosx = 2/3....Find Secx
This is one of the easier problems. Since Secx is the opposite of Cosx, all you have to do is flip the equation to get the final answer.
Confunction Identities:
Example:
Cos^2x Sin^2x- Cos(90-x)
the cos(90-x)= pi/2-x because of using the equations to the left.
That then equals: Cos2x Sinx - Sinx
You can then take out a common factor (sinx)
sinx(cos^2x-1) IDENTITY!!!
then it becomes sinx(-sin^2x)
Final Answer: - sin^3x
Example:
Cos^2x Sin^2x- Cos(90-x)
the cos(90-x)= pi/2-x because of using the equations to the left.
That then equals: Cos2x Sinx - Sinx
You can then take out a common factor (sinx)
sinx(cos^2x-1) IDENTITY!!!
then it becomes sinx(-sin^2x)
Final Answer: - sin^3x