Help please. .......
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I think it would help uh
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SAngela:
wahh ky writing hi
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mazak???
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(C) (sin²Ф+1)/cos²Ф
(a+b)²=a²+b²+2ab
(a-b)²=a²+b²-2ab
(a+b)²+(a-b)²=2a²+2b²
here a=1 & b=sin²Ф
(2+2sin²Ф)/2cos²Ф
2(1+sin²Ф)/2cos²Ф
=(1+sin²Ф)/cos²Ф
(a+b)²=a²+b²+2ab
(a-b)²=a²+b²-2ab
(a+b)²+(a-b)²=2a²+2b²
here a=1 & b=sin²Ф
(2+2sin²Ф)/2cos²Ф
2(1+sin²Ф)/2cos²Ф
=(1+sin²Ф)/cos²Ф
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