Math, asked by iaidonboklyngdoh, 2 months ago

cos 60 cos 30- sin60 sin 30=cos 90​

Answers

Answered by msyamala04
0

Answer:

Use sin(90

−θ)=cosθ and cos(90

−θ)=sinθ

and cos

2

θ+sin

2

θ=1

Now,

sin30

⋅cos60

+cos30

⋅sin60

=sin(90

−60

)⋅cos60

+cos(90

−60

)⋅sin60

=cos60

⋅cos60

+sin60

⋅sin60

=cos

2

60°+sin

2

60°=1

Answered by saalfi54
1

Answer:

cos =90

cos=1

sin =1

sin=2

cos=1

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