Question

ello every 1
plz answer this question ....​

Answer 1

Step-by-step explanation:

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please take your Ans.

Answer 2

Answer:

gn cos(a+b)=0, let a be alpha,b be beta

Step-by-step explanation:

cos 90 =0

therefore a+b=90. also a =90-b________(I)

sin(a-b) =sin(90-b-b) from (I)

=sin(90-2b)

=cos(2b) since sin(90-x)=cos x

therefore answer option (b)