Question

Cos square 45°- sin square 90°

Answer 1

Answer:we know,

Cos 45 = 1/(√2)

Therefore Cos^2(45)=1/2

And, sin 90=1

Therefore Sin^2(90)=1

Step-by-step explanation:

Now,

Cos^2(45)-Sin^2(90)=(1/2)-1=(1-2)/2=-1/2

Answer 2

Answer:

-1/2

Step-by-step explanation:

cos(45) multiply by cos(45) then subtract by sin(90)multiply by sin(90)

then IT is -1/2