Question

give answer
i give you 5point​

Answer 1

Answer:

Please refer to the attachment for answer .

Answer 2

Answer:

(i)cos70°

(ii)cot30°

(iii)sin50°

Step-by-step explanation:

(i)

sin20°=sin(90°-70°)

         =cos70°

(ii)

tan30°×tan ? =1

We know,

tan30°=√3/2

We must multiply 2/√3 with √3/2 to get 1.

Now,2/√3=cot30°

So, tan30°×cot30°=1

(iii)

cos40° = cos(90°-50°)

           =sin50°