(Cos40-sin30)/(sin60-cos50)

1 answer

recall your sum formulas.
cos40-sin30 = cos40-cos60 = 2 sin50 sin10
sin60-cos50 = cos30-cos50 = 2 sin40 sin10

so, you end up with sin50/sin40

Similar Questions

Prove that:(cos40-sin30)/sin60-cos50=tan50
1. 2 answers
Prove that(cos40-sin30)/(sin30-cos50)=tan50
1. 1 answer
Given that sin0°=cos90°, sin30°=cos60° , sin45°=cos45° , and sin90°=cos0° , what is sin60° equal to?(1 point) Responses
1. 1 answer
Given that sin0°=cos90°, sin30°=cos60° , sin45°=cos45° , and sin90°=cos0° , what is sin60° equal to?(1 point) Responses
1. 1 answer