import kotlin.math.*

fun main() {
    fun Double.toDegrees() = this * 180 / PI
    val angle = PI / 4

    println("angle = $angle rad = ${angle.toDegrees()}°")
    val sine = sin(angle)
    println("sin(angle) = $sine")
    val cosine = cos(angle)
    println("cos(angle) = $cosine")
    val tangent = tan(angle)
    println("tan(angle) = $tangent")
    println()

    val asin = asin(sine)
    println("asin(sin(angle)) = $asin rad = ${asin.toDegrees()}°")
    val acos = acos(cosine)
    println("acos(cos(angle)) = $acos rad = ${acos.toDegrees()}°")
    val atan = atan(tangent)
    println("atan(tan(angle)) = $atan rad = ${atan.toDegrees()}°")
}