7. Prove that these identities are true :- (a) 5 sin’A + 3cos? A = 2 sin’A + 3 (b) 4 cos?a - 2sin?a = 6cos'a - 2 (c) (2c
Posted: Tue Sep 07, 2021 7:31 am
7. Prove that these identities are true :- (a) 5 sin’A + 3cos? A = 2 sin’A + 3 (b) 4 cos?a - 2sin?a = 6cos'a - 2 (c) (2cos P + 3sin P) ? + (3cos P - 2 sin P)? = 13 1 (d) tanQ+ tan sin cos (e) (sin B + cosp) - (sinß- cos B) = 4 sin ßcos ß sir y cost" yan 90 120 270 ON 10 70 100 TO