That is an identity, it is true for all values of x.
Try x=-439
Solve for x:
sin2x + cos^2x = 1
0° < or equal to x < 360°
3 answers
o____O
how did you get to that value? can you show me how to solve it algabraeically?
how did you get to that value? can you show me how to solve it algabraeically?
Draw a right triangle with hypotenuse c and sides a and b. Opposite angles are then A, B, C
now sin A = a/c so a = c sin A
cos a = b/c so b = c cos A
right triangle geometry says
a^2 + b^2 =c ^2
so
c^2 sin^2 A + c^2 cos^2 A = c^2
divide both sides by c^2
now sin A = a/c so a = c sin A
cos a = b/c so b = c cos A
right triangle geometry says
a^2 + b^2 =c ^2
so
c^2 sin^2 A + c^2 cos^2 A = c^2
divide both sides by c^2
3 answers