Question

Find the value of sin 30°. cos 60° - tan2 45°.​

Answer 1

Answer:

-3/4

Step-by-step explanation:

sin 30 x cos 60 - tan2 45

sin 30 x cos(90-30) - (1)

sin 30 x sin 30 -1

1/4-1

1-4/4

-3/4

Answer 2

Answer:

-3/4

Step-by-step explanation:

sin 30 = sin ( 90 - 60 )

sin 30 = cos 60

tan 45 = 1

sin 30 . cos 60 - tan2 45

cos2 60 - tan2 45

1/4 - 1

-3/4