if tanФ +secФ=m find cosФ
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tan Ф = m - sec Ф
square on both sides
tan² Ф = m² + sec² Ф - 2m sec Ф
sec² Ф - 1 = m² + sec² Ф - 2m sec Ф
2 m sec Ф = 1 + m²
COS Ф = 2m / (1+m²)
square on both sides
tan² Ф = m² + sec² Ф - 2m sec Ф
sec² Ф - 1 = m² + sec² Ф - 2m sec Ф
2 m sec Ф = 1 + m²
COS Ф = 2m / (1+m²)
Answered by
0
tan Ф = m - sec Ф
square on both sides
tan² Ф = m² + sec² Ф - 2m sec Ф
sec² Ф - 1 = m² + sec² Ф - 2m sec Ф
2 m sec Ф = 1 + m²
COS Ф = 2m / (1+m²)
square on both sides
tan² Ф = m² + sec² Ф - 2m sec Ф
sec² Ф - 1 = m² + sec² Ф - 2m sec Ф
2 m sec Ф = 1 + m²
COS Ф = 2m / (1+m²)
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