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Pythagorean Identities Reciprocal Identities Quotient Identities Co-function Identities (Complimentary angles)

HUMAN EYE INTRODUCTION POWER OF ACCOMMODATION DEFECTS OF EYES Colour blindness (colour vision deficiency ) is a condition in which certain colours cannot be distinguished and is mostly commonly due to an inherited condition Cones (colour sensitive reception ) containing single visual pigments selection for red ,green and blue light are present in the normal

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