Trigonometry
posted by Sira on .
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

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.