Grade 12 Calculus

I need helping in filling in the blanks/

-the angle formed at the centre of the circle by two radii is the _______ angle.

-cos delta, sin delta, tan delta are known as the ___________trigonometric ration

-cos (pie/2 - x)=sinx is an example of a ________ identity

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asked by Thomas
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    posted by Reiny

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