CBSE BOARD XII, asked by Ab84, 11 months ago

These two questions can you solve them

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Answered by TheLifeRacer
13

Hi !

Solution :-

As we know that ,cos(A+B) = cosA*cosB - sinA * sinB

and cos ( A - B) = cosA*cosB - sinA*sinB

Since,in question (1)

cos(A+B) + cos(A-B)

cosA*cosB- sinA*sinB + cosA*cosB+ sinA*sinB

2cosA*cosB Answer

(2)

cos(A+ B) - cos( A- B)

cosA*cosB - sinA*sinB - (cosA*cosB+ sinA*sinB)

-2sinA*sinB Answer

___________________________

Hope it helps you !

.

@Raj


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Answered by ItzStarling
6

Explanation:

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