Question

if sina = 3/4 the cosa=​

Answer 1

Answer:

we know that

cos²a = 1 -sin²a

= 1-(3/4)²

= 1- 9/16

= 16-9/16

=7/16

hence cosa= ±√(7/16)

=±√7/4

Step-by-step explanation:

we know that cos²x + sin²x= 1

Answer 2

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