Question

(ii) 2 cos? 45° 1 = cos 90°​

Answer 1

Answer:

sin 90=1

we know that if we get sum 90 when cos x+sin y then cos x=sin y

so cos 45=sin 45

cos 45 and sin 45=0.707106781

so

2*cos 45*sin 45=0.707106781²*2=1

we proved  2*cos 45*sin 45=1

Step-by-step explanation: