Question

solve and send fast ​

Answer 1

30.

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Answer 2

Answer:

Step-by-step explanation:

sin⁴A-cos⁴A=1

(sin²A)²-(cos²A)²=1  (using a²-b² formula)

(sin²A+cos²A) (sin²A-cos²A)=1

since sin²A+cos²A=1

1*(sin²A-cos²A)=1

sin²A=cos²A+1

but sin²A=1-cos²A substituting it

1-cos²A=cos²A+1

2cos²A=0

cos²A=0

cos A=0

therefore ∠A=90°