Precalculus Archive: Questions from July 23, 2023
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ASAP
Fill in the blanks: 1. If \( \tan x=3.5 \) then \( \tan (-x)= \) 2. If \( \sin x=0.9 \) then \( \sin (-x)= \) 3. If \( \cos x=0.5 \) then \( \cos (-x)= \) 4. If \( \tan x=-3.5 \) then \( \tan (\pi+x)=2 answers -
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(a) If \( \cos ^{2}\left(38^{\circ}\right)-\sin ^{2}\left(38^{\circ}\right)=\cos \left(A^{\circ}\right) \), then \( A=[\quad \) degrees. (b) If \( \cos ^{2}(5 x)-\sin ^{2}(5 x)=\cos (B) \), then \[ B=2 answers -
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