Sum to product identities are
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Cos x + cos y formula
Ex 3.3, 11 Important
Misc 3
Misc 4 Important
Ex 3.3, 14
Ex 3.3, 15
Misc 5
Misc 7 Important
Example 16 Important
Ex 3.3, 16 Important
Ex 3.3, 17
Ex 3.3, 18 Important
Ex 3.3, 19
Ex 3.3, 20
Ex 3.3, 21 Important
Example 17 Important
Misc 6 Important
cos x + cos y formula
Last updated at March 16, 2023 by Teachoo
Sum to product identities are
Get live Maths 1-on-1 Classs - Class 6 to 12
cos x + cos y = 2 cos (x+y)/2 cos (x -y)/2 cos x - cos y = - 2 sin (x+y)/2 sin (x -y)/2 sin x + sin y = 2 sin (x+y)/2 cos (x -y)/2 sin x - sin y = 2 cos (x+y)/2 sin (x -y)/2