Question

sin 3a = cos( a - 10) ​

Answer 1

sin 3a = cos (a- 10). [sin a= cos(90-a)]

cos(90-3a) = cos(a-10)

90-3a = a-10. [ on comparing cos=cos]

-4a-a = -10-90

-5a = -100

a = -100/-5

a = 20

Answer 2

Answer:

sin(90-3a)=cos(a-10)

cos(90-a)=cos(a-10)

90-3a=a-10

4a=100

s=100÷4

therefore a=25

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