in right triangle ABC right angled at B find the value of cosA
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the envelope of gases surrounding the earth or another planet.
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Answer:
The value=1
Step-by-step explanation:
∠B=90°
∠A=∠C
Hyp= AC
Other sides= BC, AB
sinA= BC/AC
cosA=AB/AC
sinC= AB/AC
cosC= BC/AC
Using Pythagoras Theorem
AC²=BC²+AB²
sinA cosC+cosA sinC
=BC/AC*BC/AC +AB/AC*BC/AC
=BC²/AC² +AB²/AC²
=AB²+BC/AC²
=AC²/AC²
=1
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