8645764
Description
| Question | Answer |
| cos(A+B)+cos(A-B)= | 2cosAcosB |
| cos(A+B)-cos(A-B)= | -2sinAsinB |
| sin(A+B)-sin(A-B)= | 2cosAsinB |
| sin(A+B)+sin(A-B)= | 2sinAcosB |
| cos(-x)= | cosx |
| sin(-x)= | -sinx |
| tan(-x)= | -tanx |
| cosx+cosy= | 2cos1/2(x+y)cos1/2(x-y) |
| cosx-cosy= | -2sin1/2(x+y)sin1/2(x-y) |
| sinx-siny= | 2cos1/2(x+y)sin1/2(x-y) |
| sinx+siny= | 2sin1/2(x+y)cos1/2(x-y) |
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