What is cos(7y)cos(3y)-sin(7y)sin(3y) ?

The solution to cos(7y)cos(3y)-sin(7y)sin(3y) is cos(7y+3y)

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simplify cos(7y)cos(3y)-sin(7y)sin(3y)

simplify

cos (7 y) cos (3 y) - sin (7 y) sin (3 y)

cos (7 y + 3 y)

Solution steps

cos (7 y) cos (3 y) - sin (7 y) sin (3 y)

Use the Angle Sum identity:

cos (s) cos (t) - sin (s) sin (t) = cos (s + t)

= cos (7 y + 3 y)

(2 x^{2} + 6 x - 11) - (5 x^{2} - x + 7)

75 a + 4 12 a - 27 a

(\frac{x ^{2}}{y ^{3}})^{- 2}

23 \cdot 9

4 x^{2} - 20 x + 24

What is cos(7y)cos(3y)-sin(7y)sin(3y) ?
The solution to cos(7y)cos(3y)-sin(7y)sin(3y) is cos(7y+3y)