Question

what cos3theta and sign3theta​

Answer 1

No, they are not same because in 3 cos theta angle is only theta but in case of cos 3 theta the angle is 3 theta.
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Answer 2

Answer:

Use the identity (a^3+b^3)= (a+b)(a^2+b^2-ab)

sin^3A + cos^3A÷(sinA +cos ). + sinA.cosA

(sinA+cosA)(sin^2+cos^2 -sinA.cosA)÷ (sinA + cosA)+ sinA.cosA

or( sinA^2+cosA^2 -sinA.cosA) +sinA.cosA

1-sinA.cosA+sinA.cosA

1

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