**Block Category:** Transcendental

**Inputs:** Scalars

**Description:** The acos block produces the inverse
cosine of the input signal. The output is an angle in radians.

**Label:** Indicates a user-defined block label that appears when
**View > Block Labels** is activated.

**1. Computation of cos ^{-1}(1) = 0;
cos^{-1}(0) = **

This equation is realized as:

Two acos blocks are used to compute the inverse cosines. For comparison, the constant value of π/2 is generated by connecting two const blocks, set to 22 and 14, to the “l” and “r” inputs of a / block. From the results obtained, the acos blocks yield correct values for the angles.