An AC current is given by  I=I1sinωt+I2cosωt. A hot wire ammeter will give a reading:

Hot wire ammeter read =rms value of current Given AC I=I1sin⁡ωt+I2cos⁡ωt ⇒I2=I12sin2⁡ωt+I22cos2⁡ωt +2I1I2sin⁡ωtcos⁡ωt⇒=I12+I22 +I1I2⇒=I122+I222 + 0 ⇒Irms==I12+I222