Cómo resolver un problema de matemáticas 1 3 _ + _ = 6. 4

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

What is the measure of sty in oo below? 130 310 230 50

Which shows a reasonable estimation for 124% of 42 using the distributive property?