Question

prove that: (1+tan²A) cos²A=1​

Answer 1

Answer:

$(1 + { \tan}^{2} ) \times { \cos}^{2} \\ = { \sec }^{2} \times { \cos }^{2} \\ = \frac{1}{ { \cos}^{2} } \times { \cos}^{2} \\ = 1 \: \: hence \: proved \:$

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