Maths c3 trig proof
How would you prove sinA/sinB+ cosA/cosB = 2sin(A + B)/sin2B I’ve got as far as sin(A +B)/sinBcosB, not sure what I’m doing? Thanks for the help
(edited 6 years ago)
Original post by galaxy232427
How would you prove sinA/sinB+ cosA/cosB = 2sin(A + B)/sin2B I’ve got as far as sin(A +B)/sinBcosB, not sure what I’m doing? Thanks for the help
Sinply multiply the numerator and denominator by 2. Apply identity on denominator.
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