cos 60 cos 30- sin60 sin 30=cos 90
Answers
Answered by
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
1
Answer:
cos =90
cos=1
sin =1
sin=2
cos=1
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