Question

if sinA=15÷17 find cosA ​

Answer 1

Answer:

8/17

Step-by-step explanation:

Hope it helps you.......

Answer 2

Answer:

8/17

Step-by-step explanation:

Given that,

sinA = 15/17

To find the value of cosA.

We know that,

sin^2A + cos^2A = 1

Substituting the values, we get,

=> (15/17)^2 + cos^2A = 1

=> cos^2A + 225/289 = 1

=> cos^2A = 1 - 225/289

=> cos^2 A = (289-225)/289

=> cos^2A = 64/289

=> cos^2A = (±8/17)^2

=> cosA = ±8/17

Hence, required value of cosA is ±8/17.

Some Trignometric Identity:-

• sec^2A = 1+ tan^2A
• cosec^2A = 1 + cot^2A