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/hal_nxp-3.5.0/mcux/mcux-sdk/middleware/issdk/algorithms/sensorfusion/sources/
Dorientation.c702 float fetarad4; // eta (rad)^4 in fQuaternionFromRotationVectorDeg() local
723 fetarad4 = fetarad2 * fetarad2; in fQuaternionFromRotationVectorDeg()
724 sinhalfeta = fetarad * (0.5F - ONEOVER48 * fetarad2 + ONEOVER3840 * fetarad4); in fQuaternionFromRotationVectorDeg()