Math, asked by sunnysmoker23, 1 year ago

what is the formula for cos (c+d) and cos (c-d)​

Answers

Answered by sajan46
6

cos(c+d)=cosc.cosd-sinc.sind. cos( c-d)=cosc.cosd+sinc.sind

Answered by pinquancaro
7

\cos(c+d) = \cos c\cos d - \sin c\sin d

\cos(c-d) = \cos c\cos d+\sin c\sin d

Step-by-step explanation:

To find : What is the formula for cos (c+d) and cos (c-d)​ ?

Solution :

We know by trigonometric identities,

\cos(A+B) = \cos A\cosB - \sin A\sin B

Substitute, A=c and B=d,

\cos(c+d) = \cos c\cos d - \sin c\sin d

Another one, \cos(A-B) = \cos A\cosB + \sin A\sin B

Substitute, A=c and B=d

\cos(c-d) = \cos c\cos d+\sin c\sin d

#Learn more

What are the formulas [ not in syllabus just curious ] :

sin2A

cos2A

tan(A+B)

sin(A+B)

cos(A+B)

What is factorial of a number ?

What is binomial theorem ?

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