Question

(｀・ω・´)

求這題

5
7. 設為廣義角,且 tand + coto=205,則sinox cosb =
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0
to

Answer 1

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熙

tan=sin/cos
cot=cos/sin
tan+cot=(sin^2+cos^2)/(sin*cos)=1/(sin*cos)=2√5
sin*cos=1/2√5= √5/10