a. Let cosx = (-) and cos x lies below the x axis. 2+0 Find sin(2x), cos(2x) and tan(2x). b. Proof the formula of unit circle x? + y? = 1, and explain it in your own words

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Let cosx = (- and cos x lies below the x axis .
a.
2+0
Find sin(2x), cos(2x) and tan(2x).
b. Proof the formula of unit circle x² + y? = 1, and explain it in your own words
Transcribed Image Text:Let cosx = (- and cos x lies below the x axis . a. 2+0 Find sin(2x), cos(2x) and tan(2x). b. Proof the formula of unit circle x² + y? = 1, and explain it in your own words
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