Math, asked by india47, 10 months ago

can anyone solve this question​

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Answers

Answered by pal69
2

Answer:

(secA-tanA

Step-by-step explanation:

(secA+tanA) (secB+tanB) (secC+tanC) =

(secA-tanA) (secB-tanB) (secC-tanC)

multiple by,

(secA-tanA) (secB-tanB) (secC-tanC) both sides

(secA+tanA) (secB+tanB) (secC+tanC)(secA-tanA) (secB-tanB) (secC-tanC) =(secA-tanA)² (secB-tanB)² (secC-tanC) ²

(sec²A-tan²A) (secB-tanB²B) (sec²C-tan²C)

=(secA-tanA)² (secB-tanB)² (secC-tanC) ²

[(secA-tanA) (secB-tanB) (secC-tanC) ]²=1

(secA-tanA) (secB-tanB) (secC-tanC) =±1,

now therefore

(secA+tanA) (secB+tanB) (secC+tanC)=±1

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