Question

Given sin 15⁰=p and cos 25⁰=q, express cos 40⁰ in terms of p and q

Answer 1

Answer:

bsfw happy eid Rd so so doc to eid wild at Nandan stuff aaj jo ft

Answer 2

Answer:

qcos15-psin25

Step-by-step explanation:

as cos(A+B) is cosAcosB - sinAsinB

cos40 can be written as cos(25+15)

so cos25 cos15 - sin25sin15

given sin15=p and cos25=q

qcos15-psin25