4. *sin2П[email protected]П[email protected]*/*cos*П/2*с[email protected]+sin*П/2*[email protected]*=-1/1=-1 т.к. sin2П=0, cosП/2=0
3. *cos*3П/2*[email protected]*3П/2*[email protected]*/*sinП[email protected]П[email protected]*[email protected]/[email protected][email protected] т.к. cos3П/2=0, cosП=0
4. *sin2П[email protected]П[email protected]*/*cos*П/2*с[email protected]+sin*П/2*[email protected]*=-1/1=-1 т.к. sin2П=0, cosП/2=0
3. *cos*3П/2*[email protected]*3П/2*[email protected]*/*sinП[email protected]П[email protected]*[email protected]/[email protected][email protected] т.к. cos3П/2=0, cosП=0