if cosA =x /y find the value of cot A
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cosA=x/y IE b/h
b=x and h=y
h²=p²+b²
y²=p²+x²
y²-x²=p²
√y²-x²=p
cotA= b/p=x/√y²-x²=x/√(y-x) (y+x)
b=x and h=y
h²=p²+b²
y²=p²+x²
y²-x²=p²
√y²-x²=p
cotA= b/p=x/√y²-x²=x/√(y-x) (y+x)
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