- Need a help with this problem prove identity sec(A+B) = cos(A-B)/cos^2A-sin^B?

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How do I solve this? 'find the value of x using sin cos or tan.'
it is sin42° = 9/x how do I solve this if the x is on the denominator? Would the solar eclipse cause permanent damage to electrical equipment? I have 113 maps. It takes me 2 hours to complete them. If I have 1 then 2 then 3 people to help me how long will it take.? What 5 numbers equal 168? In a triangle ABC: b-a=22 cm, sinB:sinC:sinA=63:25:52.find the smallest side of this triangle.?