求三角函数的值 sin7π/4(精确到0.01) sin(-119°45″)

问题描述:

求三角函数的值 sin7π/4(精确到0.01) sin(-119°45″)

sin(7π/4) = - sin(π/4) = - √2/2 ≈ - 1.414 /2 ≈ - 0.71
sin( -119°45') ≈ - sin( 119.75 × π / 180) ≈ - sin(2.09) ≈ - 0.87