sin ,cos and tan functions !!!

hello ;

i want to create a simple calculator for only sin , tan and cos functions ,

the calculator is containing 3 buttons to calculate an input label and 3 output labels for each function

but when i wrote the following code for every button all the functions were wrong

on(release){

output_txt.text = Math.cos(input1_txt.text)

}

on(release){

output_txt.text = Math.tan(input1_txt.text)

}

on(release){

output_txt.text = Math.sin(input1_txt.text)

}

what is the right code to make these functions