Mathematics
26.03.2021 06:10
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Which of these happened in Precambrian time? A. The first mammals appeared. B. Life
Which of these happened in Precambrian time?
A. The first mammals appeared.
B. Life began to evolve on Earth.
C. A mass extinction wiped out most dinosaurs.
D. Life on Earth began to move from water to land
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B. Life began to evolve on Earth.
C. A mass extinction wiped out most dinosaurs.
D. Life on Earth began to move from water to land
ellllaaaxx
4,8(75 marks)
Step-by-step explanation:
tanx + cotx = secx / sinx
take left hand side
=tanx + cotx
=sinx/cosx + cosx/sinx
=sinx*sinx+cosx*cosx/sinx*cosx
=sin^2x + cos^2x/sinx*cosx
=1/sinx*cosx
=1/cosx * 1/sinx
=secx/sinx
at second last step i changed multiplication sign into divide sign and write the reciprocal of 1/sinx which is sinx.
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