Sunday

April 20, 2014

April 20, 2014

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

1) sin^2θ - cos^2θ = 2 sin^2θ - 1

- Trigonometry -
**Godwin**, Thursday, January 10, 2013 at 3:04amsin^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.

**Related Questions**

math - suppose you use the rule (3x+1,3y-4) to transform the original figure ...

trig - I do not understand these problems. :S I'd really appreciate the help. ...

Trig - The question is: Set up a 2 column proof to show that each of the ...

Physics - Suppose you are asked to determine the perimeter of a seven-sided ...

Physics - A 60.9 kg climber is using a rope to cross between two peaks of a ...

math - how do you isolate a variable? my teacher gave us questions and we are ...

trigonometry - Suppose θ is an angle in standard position whose terminal ...

algebra - Set the equations equal to each other so you can determine when the ...

proof by mathematical induction - subject is PreCalulus. 2^(k+3) = and < (k+3...

physics - A U-shaped tube contains a fluid of density 1.5x10^3 kg/m^3. the right...