in a triangle ABC sin A - cos B = cos c then angle B is
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Answer:
movement in circles around a central pointmovement in circles around a central point
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Answer:
correct options is A, we have, sin
Step-by-step explanation:
We have, sinA−cosB=cosC⇒2sin
2
A
cos
2
A
=2sin
2
A
cos(
2
B−C
)cos
2
A
=cos(
2
B−C
)[∵sin
2
A
=0]⇒
2
A
=
2
B−C
⇒A=B−CBut A+B+C=πTherefore, 2B=π⇒B=
2
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