using or and appropriate triangle calculate the exact value of .
you should now that
this should be an easy calculation.
should be able to take it form there
If cos (-) = 4/5 , 0 < (-) < pie/2
find the exact value of
(a) sin 2(-)
(b) sin 4(-)
given that tan x = square root of 11 all over 3, o < x < pie/2 , find the exact value of sin x
If anyone could help me with these questions id be gratefull
edit : damn.. can anyone help me show that sin (2x + x) = 3sin x - 4sin(to the power of 3)x