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## Answers

We know that cos90 = 0

since, cos(4x-10)=0

therefore, (4x-10)=90

》4x=100

》x=100÷4

》x=25(ans).

since, cos(4x-10)=0

therefore, (4x-10)=90

》4x=100

》x=100÷4

》x=25(ans).

sooo...(4x-10)=90

4x=90+10(-10 wen brought to da ryt is positive)

4x=100

x=100/4(4 multiplied on the ryt wen brought to da left is divided)

x=25

thus,x=25.