Question

cos-1(3x) - cos-1(x)=π/4​

Answer 1

tan cot x x.. =. : x > 0. = – π + cot–1x. : x < 0. 4. sin–1 (–x) = –sin–1x. : x ∈[–1,1] cos–1 (–x) = π−cos–1x.