Given that sin =a/b then cos is equal to what ??
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4
sin=a/b
than
cos=?
cos=c/b
Hope it helpz u☺❤
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1
Answer:
Let PRQ BE A RIGHT ANGLED TRIANGLE AT R, ANGLE R IS 90 DEGREE
LET ∠PQR =∅
SO BY PYTHAGORUS THEOREM
PQ²=PR²+QR²
→b²-a²=QR²
→QR=√b²-a²
cos∅=base/ hypotenus
so cos∅= √b²-a² / b²
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