Posted by **Sira** on Thursday, January 10, 2013 at 2:29am.

How am I suppose to transform the left side of the equation into the right side using trig identities? ):

1) sin^2θ - cos^2θ = 2 sin^2θ - 1

- Trigonometry -
**Godwin**, Thursday, January 10, 2013 at 3:04am
sin^2x + cos^2x = 1

from the above,we make cos^2x the subject of the formula:

cos^2x = 1- sin^2x......................(1)

substituting the above into the left hand side of original equation:

sin^2x - ( 1 - sin^2x )

expanding the bracket and noting that - times - equals +

sin^2x - 1 + sin^2x

rearranging:

2sin^2x - 1.

## Answer this Question

## Related Questions

- Math - Calculus - The identity below is significant because it relates 3 ...
- math - Prove the following identities: a) (cosec θ + cotθ)(cosecθ...
- 2 math ?s - Thank you so much in advance! Verify each identity. Work one side (...
- trig - Use the fundamental identities to simplify the expression. cos^2θ/...
- trig - The terminal side of θ lies on a given line in the specified ...
- Algebra 2/ Trigonometry - The expression oos˛ θ/sin θ + sin θ is ...
- Trigonometry - Which of the following is equivalent to 1 − cos 2 θ/...
- trigonomery - Show that the following statement is true by transforming the left...
- Trigonometry - Hi. I am reposting this. Can you verify. Thanks. (cosθ) / (...
- trig - Use standard identities to express sin(2θ+π/3) in terms of sin...

More Related Questions