Question

Hey mates♥️♥️✌ cos²47° - sin²43° equals to what? please with procedure.

Answer 1

the answer is o.....hope this will help u

Answer 2

{ Solution : }

Question : Cos²47 - Sin² 43

Note : Sin²(90-A) = Cos² A

Cos²(90-A) = Sin²A

Change Cos into Sin I.e.Cos²(90-43)

Now,

________________

➡ Cos²47 - Sin² 43

➡ Cos²(90-43) - Sin²43

➡ Sin² 43 - Sin²43

[ Cancelled ]


➡ 0

Trigonometry Identity used !

✒ Sin²(90-A) = Cos² A

✒ Cos²(90-A) = Sin²A