Question

Why is sin60°=sin120°?
and don't solve it this way.
=> sin120°=sin(120°-60°)=sin60°.​

Answer 1

Answer:

Hey!

You must know only one rule to solve these type of questions.

Sin ( 180° - theta) = Sin theta°

Now,

Sin ( 180° - 60°) = sin 60°

so, sin 120° = sin 60°

Hence proved. :)

Answer 2

Answer:

Step-by-step explanation: because if you go through trigonometry properly,

It gives you rule,

Sin(a-b)=cosasinb-sinacosb

And also in such way your hypotenuse is not going to be same.

Sin120=sin(1×90+30)=cos30=√3/2