Question

sin(70 degree) - cos(40 degree). what is the answer??​

Answer 1

Answer:

0.17364817766

this is the answer

Answer 2

Answer:

Sin10°

Step-by-step explanation:

We can convert both of them into sin or cos.Here I'm doing sin.

sin70°-cos40°

sin70°-cos(90-50)°. {cos(90-x)=sinx}

sin70°-sin50°

2cos[70+50 /2].sin[70-50 /2].

{since sinC-sinD = 2cos[C+D /2].sin[C-D /2]}

=> 2cos(120/2) sin (20/2)

= 2cos60 sin 10

= 2(1/2) sin10

= sin 10°