Examlex
Write the expression in terms of its cofunction.
-sin 38°
Frontalis
A facial muscle that lifts the eyebrows and causes wrinkles on the forehead, being part of the occipitofrontalis muscle.
Zygomaticus
A muscle of the face, which draws the angle of the mouth superiorly and posteriorly to allow for smiling.
Temporalis
A muscle located on the side of the skull that is involved in chewing and jaw movement.
Buccinator
A muscle of the cheek that helps in mastication by pushing food onto the molars and is also involved in facial expression.
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