Question

prove that sin A +cos A =cosA​

Answer 1

Answer:

Hello , this identity is not applicable for all values of angle A

It is only possible when

measure of angle A will be 0° or Pie or

(n × pie) [where n will be an even]

Verification :-

take A=0°

we have L.H.S = sin0° +cos0° = 1

& R.H.S = cos0° = 1

similarly,

take A=pie

we have L.H.S= sin(pie) + cos (pie)=

= 0 -1 =-1

& R.H.S= cos (pie) = -1

Also at A = n pie .....n= even

Hence verified. .....

Thank you! !

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