Question

Sin^2A= Please answer quickly

Answer 1

Sin^2A=1-cos^2A

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Answer 2

Hey there!

We know that,

sin²A + cos²A = 1

sin²A = 1 - cos²A

Also,
tanA = sinA / cosA

sinA = tanA * cosA

Squaring on both sides, We obtain

sin²A = tan²A * cos²A

And,
sinA = 1/cscA

sin²A = 1/csc²A

Next,

cotA = cosA / sinA

sinA = cotA / cosA

sin²A = cot²A / cos²A

So,

sin²A = 1 - cos²A = tan²A * cos²A = cot²A / cos²A