Sin 35° sin 55° - cos 35° cos 55° evaluate this
Added by Purificaci-N J.
Step 1
First, we can use the identity: sin(A)sin(B) - cos(A)cos(B) = cos(A+B) So, we have: sin 35° sin 55° - cos 35° cos 55° = cos(35° + 55°) = cos 90° = 0 Show more…
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