Given: cos(x)=4/5, Find sin(x/2), cos(x/2), tan(x/2)

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Question: half-angle-formula
give that cos x=(4/5) and 0 degrees ‹ x ‹ 90 degrees. determine the exact values of sin (x/2), cos (x/2) and tan (x/2). show work and rationalize. Can someone show how to do cos and tan for this problem?

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Answered By:

Victoria V.
Tutoring Algebra for Many, Many Years

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