Question

Find the value of cot-1(-1)

Answer 1

Heya!!

Cot-¹( -x ) = π - Cot-¹ ( x )

Cot-¹ ( -1 ) = π - Cot-¹ ( 1 )

Cot-¹ ( - 1 ) = π - π/4

Becoz Cot-¹ ( 1 ) = π/4

Cot-¹ ( -1 ) = (4π - π )/4

Cot-¹ ( -1 ) = 3π/4