Question

plzz anyone plzz answer it and the answer is 1×3/4 plzz explain it plzz​

Answer 1

Answer:

hope you got your answer

Answer 2

Step-by-step explanation:

cos 0 = 1

sin 45 = 1/√2

sin 30 = 1/2

sin 90 = 1

cos 45 = 1/√2

cos 60 = 1/2

putting all these values ,

(1 + 1/√2 + 1/2) (1 - 1/√2 + 1/2)

rationalise 1/√2 we get √2/2

(1 + √2/2 + 1/2) (1 - √2/2 + 1/2)

(3 + √2 / 2) (3 - √2/2)

=9 - 2/4

=34/4

=17/2

hope it helps