...hi guys,

i have a problem with this trig equation.

1)5sinxcosx - sinx = 0

factor ...

set each factor equal to 0 and solve for x

2) tan(30 - x) = 2.

note that

3) for the third question can someone prove this identity for me pls, i really have trouble proving it

sinxtanx + cosx = secx

change tanx to sinx/cosx , get a common denominator, and add the two terms on the left side.