Question

5) If tane=21/20 then find sing and cose.​

Answer 1

Step-by-step explanation:

please see attached file and you will get answer

Answer 2

if tanA = 21/20 then find sinA and cosA

⇒ tanA = 21/20

   Square on both sides:

⇒ tan²A = (21/20)²

⇒ sec²A - 1 = 441/400

⇒ sec²A = 441/400 + 1

⇒ 1/cos²A = (441 + 400)/400

⇒ 1/cos²A = 841/400

⇒ 400/841 = cos²A

⇒ 20/29 = cosA

 Using tanA = sinA/cosA

 tanA x cosA = sinA

 (21/20) x (20/29) = sinA

 21/29         = sinA